how is a plane mirror used in the Opticians room how is a plane mirror
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A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface).
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in the opticians room 2 double the effective length of the room a mirror is kept on the opposite wall of the roots and that mirror is known as a plane mirror
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