Question

find the refractive index of the glass which is a symmetrical convergent lens if it's focal length is equal to the radius of curvature of it's surface​

Answer 1

Explanation:

Given:f=R

1

=−R

2

=R(let)

from lens maker's formula

f

1

=(μ−1)(

R

1

1

−

R

2

1

)

R

1

=(μ−1)

R

2

μ=

2

3