Tamil Nadu Board of Secondary EducationHSC Science Class 12th

# Obtain the lens maker’s formula for a lens of refractive index n2 which is separating two media of refractive indices n1 and n3 on the left and right respectively. - Physics

Numerical

Obtain the lens maker’s formula for a lens of refractive index n2 which is separating two media of refractive indices n1 and n3 on the left and right respectively.

#### Solution

"n"_2/"v" - "n"_1/"u" = ("n"_2 - "n"_1)/"R"

Refraction at 1st surface-

"n"_2/"v'" - "n"_1/"u" = ("n"_2 - "n"_1)/"R"_1    ...(1)

Refraction at 2nd surface-

"n"_3/"v" - "n"_2/"v'" = ("n"_3 - "n"_2)/"R"_2   ...(2)

"n"_3/"v" - "n"_1/"u" = ("n"_2 - "n"_1)/"R"_1 + ("n"_3 - "n"_2)/"R"_2

Concept: Spherical Mirrors
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