Two thin lenses have a combined power of + 9 D . When they are separated by a distance of 20 cm , their equivalent power becomes + 27 5 D . Their individual powers (in dioptre ) are

Question

Two thin lenses have a combined power of + 9 D . When they are separated by a distance of 20 cm , their equivalent power becomes + 27 5 D . Their individual powers (in dioptre ) are, 4 , 5, 3 , 6, 2 , 7, 1 , 8

MARKS App · Accepted Answer

P 1 + P 2 = 9 P = P 1 + P 2 - d P 1 P 2 27 9 = 9 - 20 100 × P 1 P 2 The above equation is correct only for P 1 = 3 a n d P 2 = 6

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