**Question:**

how to find radius if curvature

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R=V^2÷a

In optics we mainly discuss the five types. The five are 1)plane mirror 2)concave mirror 3)convex mirror and concave and convex lens for a plane mirror as it is a part of a plane but not of a curved one so radius of curvature is zero and concave mirror is a part of a sphere the radius of curvature will be the radius of the sphere

Find the normal acceleration a.

R = v^2/a where v is the tangential velocity.

Be specific dude. Mention whether for a lens or for a mirror?

There are many conditions, likena medium is present on the other side of lens and like that,.

Twice of focal length is called radius of curvature

U can find it by many ways...

It is double of focal length

U can use formula:-

2/R=1/u+1/v

U is object distance

V is image distance

R is radius of curvature

This formula u can apply to concave as well as convex mirrors.....

Just thing is about sign convention...

This is a very important topic for jee advance aspirants to known about radius of curvature. @Kunal- it varies from conic to conic. For example it is different for parabola to that if circle

The radius of the sphere of which the mirror is a part of dat sphere this is known as radius of __curvature__