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Question: At what distance from a convex lens of focal length 30 cm, an object should be placed so that the si...

At what distance from a convex lens of focal length 30 cm, an object should be placed so that the size of image be half of object –

A

30 cm

B

60 cm

C

15 cm

D

90 cm

Answer

90 cm

Explanation

Solution

m =

\ – 12\frac { 1 } { 2 }= +30+30+u\frac { + 30 } { + 30 + u }

30 + u = – 60

\ u = – 90 cm