A transparent thin plate of a polaroid is placed on another similar plate such that the angle between their axes is 30° The intensities of the emergent and the unpolarised incident light will be in the ratio of

Question

A transparent thin plate of a polaroid is placed on another similar plate such that the angle between their axes is 30° The intensities of the emergent and the unpolarised incident light will be in the ratio of (A) 1: 4 (B) 1: 3 (C) 3: 4 (D) 3: 8

Tardigrade Admin · Accepted Answer

(I/I0 / 2)= cos 2 θ (I/I0 / 2)= cos 2 30°=((√3/2))2=(3/4) (I/I0)=(3/8)

Q. A transparent thin plate of a polaroid is placed on another similar plate such that the angle between their axes is $3 0^{\circ}$ The intensities of the emergent and the unpolarised incident light will be in the ratio of

1 : 4

1 : 3

3 : 4

3 : 8

$\frac{I}{I _{0} /2} = cos^{2} θ$
$\frac{I}{I _{0} /2} = cos^{2} 3 0^{\circ} = (\frac{3}{2})^{2} = \frac{3}{4}$
$\frac{I}{I _{0}} = \frac{3}{8}$

Q. A transparent thin plate of a polaroid is placed on another similar plate such that the angle between their axes is 30∘ The intensities of the emergent and the unpolarised incident light will be in the ratio of