Miscellaneous

Practice Questions:

Question 1: difficult

Two polaroids are placed in the path of unpolarised beam of intensity I0 such that no light is emitted from the second polarioid. If a third polaroid whose polarization axis makes an angle θ with the polarization axis of first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be :

1. \[\frac{I_{0}}{8}sin^{2} 2\theta\]

2. \[\frac{I_{0}}{4}sin^{2} 2\theta\]

3. \[\frac{I_{0}}{2}cos^{4} \theta\]

4. \[I_{0}cos^{4} \theta\]

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Question 2: moderate

Two polaroids are placed in the path of unpolarized beam of intensity I0 such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle θ with the polarization axis of first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be :

1. \[\left( \frac{I_{0}}{8} \right)sin^{2} 2\theta\]

2. \[\left( \frac{I_{0}}{4} \right)sin^{2} 2\theta\]

3. \[\left( \frac{I_{0}}{2} \right)cos^{2} \theta\]

4. \[I_{0}cos^{4} \theta\]

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Question 3: moderate

A light has amplitude A and angle between analyser and polariser is 60 degree. Light is transmitted by analyser has amplitude.

1. A√2

2. A/√2

3. √3 A/2

4. A/2

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Question 4: moderate

Two Nicols are oriented with their principal planes making an angle of 60°. The percentage of incident unpolarized light which passes through the system is :

1. 50%

2. 100%

3. 12.5%

4. 37.5%

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Question 5: moderate

The graph showing the dependence of intensity of transmitted light on the angle between polariser and analyser, is :

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