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There is a small pin on a table. The pin...

There is a small pin on a table. The pin is viewed from 50 cm above it. Now without disturbing the pin, a glass slab of 15 cm thickness is held above the pin, parallel to the table top. If the refractive index of glass is 1.5 , calculate the height (in cm) at which (from the pin) the image of the pin is formed.

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