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The equivalent focal length of coaxial contact combination of two lens of power -15 D and +5 D will beA) -10 cm B) +10 cm C) -20 cm D) +20 cm |
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Answer» The correct option is A) -10 cm. Power of lens =1/F Total power p = 15 + 5 = -10 D P = 1/f F= -10 cm |
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