The optical rotation of the substance is

the rotation of plane-polarized light by a substance

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changes the direction of polarized light

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does not allow plane polarized light to pass through

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rotates the plane polarized light

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Solution

The correct option is A
the rotation of plane-polarized light by a substance

Plane-polarized light is, having the same direction of vibration for all the waves.
Optical rotation is the angle at which the plane of polarization rotates as it passes through a layer of liquid.
It is also known as polarization rotation.
Hence, option A is the correct answer.

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