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At what distance from a convex lens of focal length `30cm` an object should be placed so that the size of image be `(1)/(4) `that of object?
A. 30 cm
B. 60 cm
C. 15 cm
D. 150 cm

1 Answer

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Correct Answer - D
(d) Image is real, because virtual imafe is enlarged.
`therefore 1/v-1/u=1/for 1/(x//4)+1/x=1/30(thereforeu=-x)`
`5/x=1/30`
`therefore` x=150 cm

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