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Image Formation by Spherical Mirrors

A convex lens...

Question

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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Solution

Image is formed at the focus of the lensThe image coincided with the object itself 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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