Question

write the formula for power of combination of lens

Answer 1

Answer:

$\frac{1}{focal \: length}$

Answer 2

The combined power of two lenses in contact is + 10 D. When they are separated by 20 cm, their power becomes 6.25 D. Find the power of individual lenses. Hence power of lenses, P1 = 7∙5 D and P2 = 2.5 D.

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