Optics Question 818

Question: A piano convex lens fits exactly into a piano concave lens. Their plane surface are parallel to each other. If the lenses are made of different materials of refractive indices μ1 & μ2 and R is the radius of curvature of the curved surface of the lenses, then focal length of combination is

Options:

A) Rμ1μ2

B) 2Rμ1μ2

C) R2(μ1μ2)

D) R2(μ1+μ2)

Show Answer

Answer:

Correct Answer: A

Solution:

[a] 1F=1f1+1f2

1F=(μ11)(1+1R)+(μ21)(1R1)

=μ1μ2R

F=Rμ1μ2



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