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Plz answer this question(A) Device X is a concave mirror and device Y is a convex lens, whosefocal lengths are 20 cm and 25 cm respectively."(B) Device X is a convex lens and device Y is a concave mirror, whose focallengths are 10 cm and 25 cm respectively.(C) Device X is a concave lens and device Y is a convex mirror, whose focallengths are 20 cm and 25 cm respectively.(D) Device X is a convex lens and device Y is a concave mirror, whose focallengths are 20 cm and 25 cm respectively.(CBSE 2017)​

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EXPLANATION:

the OPTION a is APPROPRIATE



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