A plano-convex lens (focal length f 2 , refractive index μ 2 , radius of curvature R) fits exactly into a plano-concave lens (focal length f 1 , refractive index μ 1 , radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal length of the combination will be :
A
B
f 1 – f 2
C
D
f 1 + f 2
Text Solution
Verified by ExpertsThe correct answer is:
A
= ( μ 2 –1) 
When joined together
= 
+ 
= 
+ 
= 
f eq = 
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