Question

the focal length of Plano convex lens is equal to its radius of curvature thevalue of refractive index of the material is​

Answer 1

Answer:

Where 'f' is the focal length and 'R1' is the radius of the first surface of the lens and 'R2' is the radius of second surface of the lens and 'μ' is the refractive index of the lens. For plano-convex lenses the 'R1' will be zero and 'R2' will be equal to '-R'.

Answer 2

Answer:

this is your answer.

Explanation:

given

focal length f = R where R = radius of curvature

we know that

1/f = u -1/f

1= u - 1

u =2

hope it will help you.