An achromatic combination of a concave and convex lenses has power 5 D . If the power of convex lens is 4 D , then the magnitude of focal length of concave lens is

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10 cm

200 cm

100 cm

20 cm

answer is C.

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Detailed Solution

P=P1+P2 5=4-P2P2=5−4=-1 Df2=100P2=100-1=-100 cm

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