Light Chapter Class 8 Science (Chapter 16) in One Shot | BYJU'S - Class 8

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Welcome, Achievers! In today’s episode of BYJU'S Champions, our BYJU’S expert explains CBSE Class 8 chapter "Light" in one shot.
This is a very informative session, as Saurabh Sir teaches in depth about the laws of reflection, types of reflection, multiple reflection, kaleidoscopes, dispersion of light, and the human eye in one shot.
Saurabh Sir leads you through the concepts in a very interesting way. So make sure to watch the video till the end and use the live chat box to clear your doubts.
Don’t forget to like, share, and comment.
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Introduction to Light
Light is a fundamental aspect of our perception of the world around us. It enables us to see and interact with objects. In the context of Class 8 Science, understanding light involves exploring its properties, behavior, and how it interacts with different surfaces.
Nature of Light
Light behaves as both a particle and a wave. It travels in straight lines and can be reflected, refracted, or absorbed by different materials. The phenomenon of reflection is particularly significant, as it allows us to see objects. When light hits an object, some of it is reflected back to our eyes, enabling us to perceive the object's shape and color.
Reflection of Light
The concept of reflection involves the bouncing back of light rays when they strike a surface. This process can be categorized into two types: regular (or specular) reflection and diffuse reflection. Regular reflection occurs on smooth surfaces, such as mirrors, producing clear images. In contrast, diffuse reflection happens on rough surfaces, scattering light in multiple directions, resulting in unclear images.
Laws of Reflection
The laws of reflection are crucial to understanding how light behaves. The first law states that the angle of incidence equals the angle of reflection; both angles are measured from the normal, an imaginary line perpendicular to the surface at the point of incidence. The second law asserts that the incident ray, reflected ray, and normal all lie in the same plane.
Human Eye and Vision
The human eye is an intricate organ responsible for vision. Light enters through the cornea, passes through the pupil, and is focused by the lens onto the retina, where it forms an image. The retina contains photoreceptor cells that convert light into neural signals, which are sent to the brain via the optic nerve. This process allows us to perceive colors and shapes.
Color and the Spectrum
White light is composed of multiple colors, which can be observed when it is refracted through a prism or during natural phenomena such as rainbows. The spectrum of light includes seven colors: red, orange, yellow, green, blue, indigo, and violet. Each color has a different wavelength, contributing to its unique properties.
Applications of Light
Light has numerous applications in everyday life, such as in optical instruments like periscopes and telescopes, which utilize reflection and refraction to enhance our ability to observe distant objects. Understanding light is also essential in fields such as photography and astronomy.
Conclusion
In summary, the study of light encompasses its nature, behavior, and significance in our daily lives. By grasping these concepts, students can appreciate the role light plays in enhancing our understanding of the world, preparing them for advanced studies in physics and related fields.
plss give a like it took a long time to type this..............................

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Thank you for this summary

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00:16 Preparing for Class 8th light chapter
04:04 Light enables us to see and understand the world around us.
09:01 Reflection, angle of incidence, and normal in light.
12:14 First law: Angle of incidence is equal to angle of reflection
19:06 Mirror reflection explained: regular vs. diffuse.
21:50 Understanding irregular reflection and its impact on the surface
27:39 Symmetrical letters are reflected the same in a mirror
30:32 Properties of Image Formation by Plane Mirror
36:02 Creating beautiful patterns using multiple reflections
38:06 Take help now for small information, as you won't get another chance later
43:05 White light splits into its constituent colors
45:17 Pupil size changes with light intensity
49:24 Optic nerve and blind spots explained
52:46 Transition from bright light to darkness activates cells inside our eyes
57:10 Taking a break for 2-3 minutes is important for children's learning

[@pastRECAPED]

Thank you for this

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Correct

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❤❤

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Important Topics covered:
00:16 Preparing for Class 8th light chapter
04:04 Light enables us to see and understand the world around us.
09:01 Reflection, angle of incidence, and normal in light.
12:14 First law: Angle of incidence is equal to angle of reflection
19:06 Mirror reflection explained: regular vs. diffuse.
21:50 Understanding irregular reflection and its impact on the surface
27:39 Symmetrical letters are reflected the same in a mirror
30:32 Properties of Image Formation by Plane Mirror
36:02 Creating beautiful patterns using multiple reflections
38:06 Take help now for small information, as you won't get another chance later
43:05 White light splits into its constituent colors
45:17 Pupil size changes with light intensity
49:24 Optic nerve and blind spots explained
52:46 Transition from bright light to darkness activates cells inside our eyes

[@sunilkumarkularia4913]

15:40

[@manujoji2524]

Vote for surabh sir
SURABH SIR 👍. 👇

[@dnspranav]

32:37 infinite hair tunnel of doom

[@Theekshana-v8k]

Backbenchers anyone here with me?

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I am

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Hi bro

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Yo here your guy here 😅

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Yo bro

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Lestt goo

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video starts from 4:28, thank me later...

[@NiviyaFoodMaker]

Tomorrow my science exam. 💀

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Kon kon Ek din Phele video dhek raha hai 😂😂😂

[@VinayaksinghChawda-wp1bu]

Me

[@ManishKumar-wu7jk]

Me not 🚫

[@mdislam6693]

Me

[@yashitha5767]

Sir I have a doubt in laws of reflection
*If angle of incident is 30 the how is angle of reflection is 60

[@tanishka_21]

As the 30 angle was between incident ray and surface and not between the normal and incident ray.. and if the angle between the the surface and incident ray is 30 then, the angle of incident will be = 90-30 which is 60 so.. the angle of reflection = angle of incidence.. that is 60.
Hope it helped you..!!

[@M3meWhy]

But angle of incidence and angle of reflection are always equal

[@AmmarAhmed-ex7yx]

So then the angle between the surface and the reflected ray will be 30 as angle of incident and reflected are equal ?

[@M3meWhy]

@@AmmarAhmed-ex7yx I didn't see the part where the question was that's why I got the answer wrong , my bad.

[@newideas6662]

Thank you Byjus ❤🎉🎉

[@NarendraSahu-nm9jk]

51:00 Yes

[@entertainmentandsuccess]

❤❤😊

[@kartikchandra4258]

last mein toh book se hi padna padta hain sari definition😢😢😢...

[@achicharu915]

Sir does diffused reflection while his head does regular reflection 👍🏿thnk u sir, you are the best teacher

[@lingeshachs4672]

sir I have a doubt, when we use a light or a ray we cant see in the air. Why?

[@neetusharmasharma9284]

Because it does not reflect

[@lingeshachs4672]

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[@neetusharmasharma9284]

@@lingeshachs4672 it's ok bro

[@ishantchardeyt2160]

18:44

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Sir you teach very good and entertaining

[@sanvirathore2015]

20:02 yes sir it's parallel

[@harshadgoswami7836]

My science exam is tomorrow
Pray for me

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How did it go

[@anjusharma6770]

sir kaunsa chapter hai?????
sir page no.?????

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back bencher be like this..

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27:08 A, H, I, M, O, T, U, V, W, X and Y.

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motu🤣🤣

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Ya❤🎉😂

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Best of luck for your tomorrow exam 😂😂😂😂😂

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😅

[@Adityalongadge]

Thanks you sir 😊 for explaining this chapter😊

[@aloksharma304]

2:52 2:54 2:55

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57:48 minutes mein sew 30 minute mehra liye 25 minutes padhaye 2:48 minutes apni tareef kiye.... bohot sahi 😊

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😀😀

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I want to join but i don't know how to join

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Mat join kar bekar hai

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Good explanation according to me..... I like this channel👌🙂🆗✨✨

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Yes
......🌻

[@snowflake7624]

Sir which part of eye give it it's colour and how? There is a white portion of eye for which reason it is?

[@seemaverma7933]

Iris gives distinctive colours in our like like brown , black , and blue. We shall read that how it gives in 9 or 10 class so have patience.

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@@seemaverma7933 Thankyou

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rods and cones

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Nice video 😊😊😊😊🎉🎉🎉

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4:30 actually class started

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Thanks Bro!

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Thku sir❤

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After 2 days my science exam is there please hope for me 😥

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I hope you you will get good marks

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Kitne marks mil gye bhai

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Abhi padrahe ho?

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Best of luck bro

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@@vibhukumarshukla6751 you are 28 day late bro 😂😅

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Thnk you sir it helped me alot

[@quazizeeshan]

Sir I am from Australia.But sir I can understand everything that you teach.

[@SugunaSuresh-c6n]

Broo
INDIA HAS THE BEST TEACHERS...😅

[@kunjan2043]

True

[@shashikantsingh5315]

19 november

[@HimanshiSadhu9294]

12:31
Sir it says that all rays go in se direction not in opposite direction

[@tanmaymandal2604]

sir, maza aaya!!👌

[@meenakshialexzander168]

My exam is in like a week this helped a lot thank u so much ❤😊😊

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All the best

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Today is my science paper 😢😢

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For you all the best

[@Godplayer884]

Sir is table a polished surface

[@Wewewe754]

yes

[@Hell_king_ghost]

I have exam tommorow and Instead of continuing the video I am looking at the circle and square lol

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hahahahahahahahah sooo funny

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Topper students be like
Sir I got 21/20 after seeing this video 😂😅

[@drajaysharma3085]

Is dangerous lazour can be reflected

[@carunews1968]

Yes because its also a type of light
But with high intensity

[@QFGAMING]

how does images appear 3d in mirror if the mirror is 2d l x b

[@Betaxgma]

The image in a mirror isn't truly 3D, but our brains perceive it as 3D due to a combination of factors:
Monocular cues: Even with just one eye, our brains use information like size, perspective, and shading to infer depth. These cues are present in the reflected image.
Binocular vision: When we use both eyes, we receive slightly different viewpoints, which further strengthens the perception of depth.
Movement: As we move our heads or the objects in front of the mirror, the image shifts slightly, mimicking how our brains expect to see 3D objects move in the real world.
The physical properties of the mirror itself (its dimensions and flatness) don't create the 3D perception. Instead, the mirror reflects light and preserves the spatial relationships between objects in the scene, allowing our brains to interpret them as 3D..

[@dineshpoonia5862]

13:56 thik ja bhai

[@TanjikoGaming]

Refraction of light?

[@Normiequeen101]

*reflection 💀💀💀

[@royalsingh-fj6tw]

😍😍😍 sir thank what are you doing

[@technical3479]

Thank you sir , now I have been understanding the chapter.

[@harshfreefiregamer4036]

😍😍😍😍😍thank you sir

[@sunilkumarkularia4913]

16:02

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PLZ START NOW SIR

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Byjus wale sikhata ache hai, lekin.......
Bachon se bolne mein 50% time aise hi chala jata hai, 1 ghante ke naam par 😩☠☠

[@surmesh9538]

Very trueee😂

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Sir what is kaleidoscope

[@carunews1968]

It’s a device used for fashion designing and is based on principle of multiple images

[@ANCHITKAR]

Sir aapke sar par dikh jayega shayad
Polished hai
Par you teach the best

[@samimaaktara5900]

Yes

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Thank you sir and byju's

[@PooH2578]

Sir I don’t understand periscope

[@MonikaGupta-vy9qd]

Same

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Thank you so much

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Any toppers

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me

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Me bro❤❤

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Let's dominate

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💪😁

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meeeeeeeeeeeeeeeeeeeeeeeeeeeee........

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Sir I'm in 9 class but I'm watch the video because I'm participate in the talnetex exam by allen 😅you are the great

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Same to you...Even I m also from class 9 and I m also participating in TÀLLÈÑTEX exam in 5th November that's why I m here ....

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What is tallentex exam?

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@@malothshruthi_17 it is a scholarship exam conducted by Allen institute

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Anyone who got Allen tallentex exam scholarship??
For people interested in I got 50 percent scholarship

[@manhaasharaf]

Sir the way you explain is sooo nice . But I am from Kerala and I don't understand Hindi . At times when you speak Hindi I don't understand . So sir it my humble request that please take clases completely in English so that I and other students who doesn't know English will understand better

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go and study on another channel

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Yes go away

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Actually telling you in a polite way "you can't change the world, you can chang your self "😊❤

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Blue eyes ,= gojo saturo 😅😅😅😅
49:30

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King ayaan💥💯💯💯💯💯💥💥💥💥🤪❤️‍🔥❤️‍🔥❤️‍🔥❤️‍🔥❤️‍🔥

[@amritadevi3404]

What the hell he is only wasting time on seeing comment's
Thanks for 12 likes

[@Osnalnsammu]

Truuee

[@renudeepa4588]

Yes you are right

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He needs to answer the question lol😂

[@PRERNAJAIN-kn2xx]

True

[@PRERNAJAIN-kn2xx]

Padha. Lo sir

[@bigpocketgamerz6838]

Paper is plane
❎paper+plane=paper plane ✅

[@adityasingh10th71]

Sir if our eyes is sensitive so why astronaut can see sun rays clearly?
🤨🤨

[@adityasingh10th71]

9

[@hashtag_komal_chaudhary]

They see through sunglasses 😎

[@NavyaNakwal-iz7vm]

Hiii sir i am fine and i hope you also fine
❤😊

[@ayushpatel-z8m]

My 1 like gave this video 4k likes

[@soniatiwari8871]

Sir how to make pericope 42:09

[@sanskritishivhare8409]

Thankyou sir for this session you made all the concepts easy

[@jaypalsule1850]

It works😊😊😊😊 I get shoke

[@BajiKaisuke-tc1pq]

Reflected light can BL reflection again

[@vindhwasisiupadhyay7425]

❤❤❤

[@krishnaagrahari7819]

Thank u so much sir for teching us , i m a student of hindi medium but i can understand everything what u r teaching since 6th class .i m very grateful . Keep it up sir and make more session like this

[@ujjawalkumar9410]

How did you write this?
By translating 😂😂😂😂

[@PrinceGupta-mz4ui]

Teaching ki spelling check krlo😂

[@ManojKumar-em9eg]

What is normal????

[@ProfiMotivationking]

Sir how to make Periscope

[@arnamawasthi5403]

😂😂😂what a question 😂 why you want to make it

[@vivanswondrfulworls.....6533]

There are 2 laws of reflection

[@dikshasen7116]

Thanyou sir sir aap ne bhot aacha padhaya

[@KhushiJyoti-f2m7g]

Sir ap bhot ache sa samjha rahe ho thanks so much sir

[@trainyourbrain2195]

My exam is tomorrow😵😱 I am scared but excited too. ☺️

[@cmdajay1]

bhai padh le

[@pramodkumarmahto3148]

Video started on 4:00

[@keralablastesfc4076]

i am from kerala i can understand the language thanks sar 😍😍😍😍

[@TechBoyzzz-it8mm]

Me too From kerala

[@TechBoyzzz-it8mm]

Which district

[@VaishnaviK-x9k]

Evidenna machaane ❤

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​Palakad ningalo?​@@VaishnaviK-x9k

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Evede onde bro 😂😇

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Who is the identity science subject sir

[@Daksh051]

Sir, will a plane mirror always do lateral inversion?

[@sunitamishra6043]

Yess

[@surendrapanditji2336]

Ya

[@vikaschaudhary7252]

Sir can you please do a session on light's chapter ncert solutions

[@cricmirch8104]

Nice session sir I am bsc student student but now I did realize something wrong after watching 👀

[@ShivaniSreedhar]

Class starts at 4:30

[@archnapandey5485]

Thank you sir for this great session!😄It will help me in my exams, thank you so much.🙂🙂

[@byjus-class-678]

Glad to hear that, All the best for exam🙂

[@Rose-2025-x2p]

Good luck for ur exms

[@CHARANSINGH-gw8lk]

Good luck dear ❤

[@RajeshKumar-yg9qx]

Sir incident Ray normal ray reflected why not say that lie on same point

[@demented_person_1]

Tomorrow is my final exam😅

[@Anshika-do2gs]

Mine also 😂😂

[@AmiPanchal-k9x]

Same here broo 😂

[@ravinaggol6371]

Nice 😊

[@Shasmit_Maurya]

Understood the chapter really well

[@vishwa-vhv]

very good explanation from every teachers

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anyone in 2025?

[@Mufti_HashimRazaMisbahi]

Ya sir your very crazy ti teach
😊😊

[@Vedank1928]

Sir apke head par se Bhot zyada reflection hota hai

[@Gamingcraft13]

Wow❤❤❤❤❤❤🎉