Modern telescopes prefer using concave mirror of large aperture as the objective instead of convex lens due to the following reasons: (1) There is no chromatic aberration in a mirror. (2) If the mirror is a parabolic mirror then even ...
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Working of an optical fibre is based on the principle of total internal reflection of light. When a signal in the form of light is directed at one end of the fibre at a suitable angle, it undergoes repeated total ...