Questions
When a parallel beam of white light passes through a convex lens, red, yellow and violet colours are focussed at 20.5 cm, 20 cm and 19.5 cm respectively. Then dispersive power of material of the lens is
detailed solution
Correct option is D
(4)1f=μ−1 1R1+R2 ⇒ μ=1+kf where k=R1R2R1+R2∴ μr=1+k20.5, μv=1+k19.5 and μY=1+k20∴ ω=μv − μrμY−1= k19.5−k20.5k/20=20 × 119.5 × 20.5=0.05Talk to our academic expert!
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Image of the sun is formed by a binconvex lens of focal length f. The image is a circular patch of radius r and is formed on the focal plane of the lens. Choose the correct statement from the following
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