# A polaroid

Question:

A polaroid

(I) is placed in front of a monochromatic source. Another polaroid

(II) is placed in front of this polaroid (I) and rotated till no light passes. A third polaroid

(III) is now placed in between (I) and (II). In this case, will light emerge from (II)? Explain.

Solution:

A polaroid

(I) is placed in front of a monochromatic source and polaroid

(II) is placed in front of polaroid (I). When the light passes through the polaroid (II), the light is unaffected.

Polaroid (II) is rotated such that there is no passage of light. The rotation is made such that the polaroid (II) is perpendicular to polaroid (I). When the polaroid (II) is rotated there is no passage of light.

When a polaroid (III) is placed between the polaroid (I) and (II) such that the polaroid (III) is not placed perpendicular to the axis, so there is no passage of light.