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A small bulb is placed at the bottom of a tank containing water to a depth . What is the area of the surface of water through which light from the bulb can emerge? You can consider the bulb to be a point source, the refractive index of water to be and the refractive index of the air to be
(a)
(b)
(c)
(d)

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Important Questions on Refraction of Light at Plane Surfaces
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The prism will:

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Then, must satisfy

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If the refractive index of the prism is , then

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A ray of light originates from inside a glass slab and is incident on its inner surface at an angle as shown,
In this experiment the location of the spot where they ray hits the screen is recorded. Which of the following correctly shown the plot of variation of with the angle ?

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[Use the fact that surface area of a spherical cap of height and radius of curvature is ]

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