Question

f is equal to 2r how it is make​

Answer 1

Answer:

focal length is equals two times of radius

Explanation:

if we want to get focal length we have double the radius

Answer 2

Answer:

First of all ur statement is not correct

R= 2f (R= radius of curvature and f= focal

length)

Radius of the sphere is the distance between C & P

U can define radius of curvature as:-

Radius of sphere of which mirror is apart

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