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Answer to Question #38958 in Optics for preet

Question #38958
A parallel beam of monochromatic light falls on a combination of a convex lens and a concave lens of focal lengths 15 cm and 5 cm respectively.What is the distance between the two lenses to obtain a parallel beam of light from the concave lens?
options are :
a) 20 cm b) 3 cm c) 10 cm d) 45 cm
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