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A double convex lens has two surface of equal radii R and refractive index 1.5 ,then focal length f
Asked by sreelekhachakali2006 | 15 Mar, 2024, 10:35: AM
answered-by-expert Expert Answer

Lens maker formula for spherical lens is

img ........................(1)

where μ is refractive index of material of lens , R1 and R2 are radius of curvature of spherical surfaces.

If both spherical surfaces are convex , then one spherical surface has positive radius of curvature

and other one has negative radius of curvature

if refractive index μ = 1.5 and R1 = R and R2 = - R , then from eqn.(1) , we get

img

img

Hence foal length = R

Answered by Thiyagarajan K | 15 Mar, 2024, 12:06: PM
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