A convex lens of focal length 25 cm is placed at a distance x from...

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A convex lens of focal length 25 cm is placed at a distance x from a concave lens of focal length 7 cm When a parallel beam is incident on the convex lens it emerges as a parallel beam out of the concave lens What is the value of x Options 20 cm 18 cm 25 cm 32 cm

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