A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm What is the area of the surface of water

Question

A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm What is the area of the surface of water through which light from the bulb can emerge out Refractive index of water is 1 33 Consider the bulb to be a point source

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