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A lens is a portion of a transparent medium bounded by two surfaces and one of these surfaces is essentially spherical. It is used to converge or diverge the light incident on it. Power of a lens is the measure of its ability to converge or diverge the light incident on it. Power of a lens depends on the refractive index of the material of lens with respect to the surrounding medium and the radii of curvature of its two surfaces.
Draw a ray diagram to invert the image without deviation of light using right angle isosceles prism.
A coin lies at the bottom of a beaker. Water is poured into the beaker upto a height of 8 cm. Calculate the shift seen in the position of the coin. (The refractive index of water is 4/3. The width of the glass wall of the beaker is negligible.) How will the apparent depth be affected if the temperature of water is increased?
Answer the following with respect to a concave lens (L).
Copy and complete the following ray diagram. Label the focus by letter F.
State one application each of a convex and a concave lens.
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