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  4. A point object is held above a thin equiconvex lens at its focus. The focal length is 0.1 m and the lens rests on a horizontal thin plane mirror. The final image will be formed at

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Q. A point object is held above a thin equiconvex lens at its focus. The focal length is $0.1\, m$ and the lens rests on a horizontal thin plane mirror. The final image will be formed at

WBJEEWBJEE 2017Ray Optics and Optical Instruments

Solution:

As the lens is placed on a horizontal thin plane mirror.
image
So due to role of plane mirror the image will be formed at the same point $O$ above $0.1\, m$ distance above the center of the lens.