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Combinations of Lenses & Mirrors

A parallel be...

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A parallel beam of monochromatic light falls on a combination of a convex lens and a concave lens of focallengths 15 cm and 5 cm respectively. What is the distance between the two lenses to obtain a parallel beanmof light from the concave lens?(1) 20 cm(2) 3 cm() 10 cm(4) 45 cm

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Q. A parallel beam of monochromatic light falls on a combination of a convex lens and 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?

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