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