A convex lens is placed over a plane mirror.A pin is now positioned so that there is no parallax between the pin and its image formed by this lens mirror combination. How will you use this observation to find focal length of the lens? explain briefly
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Image is formed at the focus of the lensThe image coincided with the object itself an the rays from the object after refraction from the lens fall normally on the mirror forms an image coinciding with the object itself.
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The rays must fall normally on the plane mirror so that the image of the pin coincides with itself.
Hence rays, like CA and DB form a parallel beam incident on the lens.
.’. P is the position of the focus of the lens.
Distance OP equals the focal length of the lens
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