Question

A symmetrical convergent lens is having focal length equal to twice the radius of curvature of its surface then refractive index of material of lens is equal to​

Answer 1

Answer:

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