Question

YOU ARE GIVEN LENSES WITH POWERS +10D, +5D, -5D, -20D AND -10 D. TAKING A PAIR OF TWO

LENSES , WHICH TWO LENSES WILL YOU SELECT TO HAVE A COMBINATION OF TOTAL FOCAL LENGTH

WHEN THE TWO LENSES ARE KEPT IN CONTACT IN EACH CASE
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Answer 1

Answer:

+10 D & -5 D are the two lenses

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