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Q.

A point like object is placed at a distance of 1 m in front of a convex lens of focal length   0.5 m. A plane mirror is placed at a distance of 2 m behind the lens. The position and nature of the final image formed by the system is 

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a

2.6 m from the mirror, real

b

1 m from the mirror, virtual

c

1 m from the mirror, real

d

2.6 m from the mirror, virtual

answer is A.

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Detailed Solution

Question Image

u=(1)+(1)+(1)=3m

 Using lens formula, 1v1u=1f

1v=1f+1u=1+0.5+13 or v=35=0.6m

Hence, distance of image from mirror

=2+0.6=2.6m and real.

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A point like object is placed at a distance of 1 m in front of a convex lens of focal length   0.5 m. A plane mirror is placed at a distance of 2 m behind the lens. The position and nature of the final image formed by the system is