JEE Main Physics Optics #1 The Convex Mirror

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The focal length f is related to the radius of curvature r of the spherical convex mirror by:
A) f = r
B) b = -(1/2)r
C) b = +(1/2)r
D) f = -r
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[@Znxjsjnsdn]

Professor how many days off is the vernal equinox?

[@sushiladevi9799]

The direction in which light is going is considered as positive direction according to sign convention, then how "f" became negative for convex mirror ? Kindly explain more on this point .

[@MichelvanBiezen]

Note the "-" sign above the "f" for focal length indicating the focal length is negative for a convex mirror.

[@Znxjsjnsdn]

Was Polaris the pole star 2k years ago?

[@MichelvanBiezen]

Yes it was.

[@Znxjsjnsdn]

@@MichelvanBiezen so the vernal equinox is 30 days off?

[@larryevans2806]

Good, optics, one of my weak spots.

[@MichelvanBiezen]

Typically less time is spent in the classroom covering optics.