Question

Plot the graph showing variation of focal length of a plano convex lens in air with change in the refractive index ( μ ) of the material of the lens.​

Answer 1

Explanation:

ANSWER

Given focal length f=R where R= radius of curvature.------(1)

We know,

f

1

=

R

μ−1

for plano-convex lens

Put the value of F from equ 1

f

1

=

F

μ−1

1=μ−1

μ=2

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