For a spherical surface of radius of curvatures R, separating two media of refractive index μ 1 and μ 2 , the two principal focal lengths are f 1 and f 2 respectively. Which relation is correct-
Text Solution
Verified by ExpertsThe correct answer is:
C
The surface has two principal focus given by
f 1 = 
, f 2 = 
f 2 = – μ f 1
⇒ f 2 = 
f 1
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