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Q.

Rays of light from a luminous object are brought to focus at a point A. A convex lens of focal length 24 cm is then placed 24 cm from A, so as to intercept the rays before they  meet A. If they meet at a point B then distance AB is

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a

18 cm

b

24 cm

c

12 cm

d

6 cm

answer is C.

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Detailed Solution

The image at A act as a virtual object for lens at a distance of 24 cm applying lens formula  1v-1u=1f 1v-124=124 1v=112  v=12    so distance AB =24-12=12
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Rays of light from a luminous object are brought to focus at a point A. A convex lens of focal length 24 cm is then placed 24 cm from A, so as to intercept the rays before they  meet A. If they meet at a point B then distance AB is