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+1 vote
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in Optics by (63.5k points)

Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm?

1 Answer

+1 vote
by (64.8k points)
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Best answer

µ = 1.55, Let R1 = R and R2 = – R  f = 20 cm. 

 Using lens makers formula.

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