Reflection of Light

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Reflection of light is the return of light into the same medium after striking a surface.

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Regular reflection occurs when a beam of light falls on a smooth and polished surface, such as a plane mirror. The reflected rays go in a fixed direction.

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Irregular reflection occurs when a beam of light falls on a rough surface such as the wall of a room or the page of a book. The reflected rays spread in different directions.

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The angle of incidence i is equal to the angle of reflection r. In symbols, ∠i = ∠r.

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The incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

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For normal incidence, angle of incidence = 0°. So angle of reflection = 0°. The ray retraces its path along the same line.

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Light enters through the polished front surface, but strong reflection takes place from the back silvered surface. The back is coated with opaque material for protection.

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A real image is formed by actual intersection of reflected rays. It can be obtained on a screen and is always inverted.