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Q.

A concave mirror forms an erect image of an object placed at a distance of 20 cm from it the size of the image formed is doubled that of the object then the position of image is

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a

50 cm

b

20 cm

c

40 cm

d

10 cm

answer is B.

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Detailed Solution

Given that

m=+2h1=2h0

u=20cm

m=vu

2=v20

v=40cm

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A concave mirror forms an erect image of an object placed at a distance of 20 cm from it the size of the image formed is doubled that of the object then the position of image is