Two thin lenses having optical powers of -10D and + 6D are placed in c – InterviewSolution

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1.	Two thin lenses having optical powers of -10D and + 6D are placed in contact with each other. The focal length of the combination is :(a) + 0.25 cm(b) – 0.25 cm(c) + 0.25 m (d) – 0.25 m
Answer» (d) – 0.25 m

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