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Q.

A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image is

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a

Virtual and at a distance of 16 cm from the mirror

b

Real and at a distance of 16 cm from the mirror

c

Virtual and at a distance of 20 cm from the mirror

d

Real and at a distance of 20 cm from the mirror

answer is B.

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Detailed Solution

Image from by the lens is at a distance 30  cm(2f) i.e. 20 cm behind the  plane mirror act as a virtual object and image is produced 20 cm in front of  plane mirror i.e 10 cm behind the lens and act as a virtual object final image 1v-110=115  and v=6 cm from the lens 16 cm form the mirror
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A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image is