Category: Ray optics and optical instruments

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When sunlight falls on small water droplets suspended in air during or after rain, it suffers refraction, total internal reflection and dispersion. The condition for observing a rainbow are that the sun should be at the back of an observer and the water droplets in front. Sunlight is first refracted when it enters a rain […]


Definition: When a light ray strikes the boundary between two media such as air and glass, a part of that light is reflected. By reflection we mean the bouncing back of the radiant energy at the boundary between the two media and this is the reason for the visibility of non–luminous bodies. LAWS OF REFLECTION: […]