Physics · Ray Optics
A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different materials with refractive indices μ1 and μ2, and R is the radius of curvature of the curved surface, then the focal length of the combination is given by:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 12Rμ2 - μ1
- 2Rμ1 - μ2✓
- 3R2(μ1 - μ2)
- 4R2(μ1 + μ2)
Correct answer
Rμ1 - μ2
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