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The normal is an imaginary line that is ____ to a surface
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The normal is an imaginary line that is ____ to a surface

User Wdickerson
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The normal is an imaginary line at right angles to the plane mirror. Smooth surfaces produce strong echoes when sound waves hit them, and they can act as mirrors when light waves hit them. The waves are reflected uniformly and light can form images.
User Ossi
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