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An equiconvex lens of focal length 10cm (at t=0) and refractive index (1.5) is placed in a medium whose refractive index varies with time as t in seconds. The value of t when the lens acts as a diverging lens of focal length 20cm is
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Correct option is B
−120=1.5μ−12R and 110=1.5−12R=1R⇒∴R=10cmSo, μ=2∴t=10 secsSimilar Questions
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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