Q.

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

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a

200cm

b

20cm

c

10cm

d

100cm

answer is C.

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Detailed Solution

P=P1+P2 

5=4-P2

P2=54=-1D

f2=100P2=100-1=-100cm 

 

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