Questions
The refractive index of a lens material is 1.5 and focal length f. Due to some chemical changes in the material, its refractive index has increased by 2%. The percentage change in its focal length is
detailed solution
Correct option is D
μ1=103100×1.5=1.545 f'f=μ-1μ'-1=1.5-11.545-1=0.92 f'f-1100=0.92-1100 f%=-8%Talk to our academic expert!
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A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices and and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is
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