Wave Optics

Practice Questions:

Question 31: 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 32: 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 33: moderate

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

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Question 34: easy

Spherical wavefronts shown in fig, strike a plane mirror. Reflected wavefronts will be as shown in:

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Question 35: difficult

White light is used to illuminate the two silts in a Young’s double slit experiment. The separation between the slits is b and the screen is at a distance d (> > b) from the slits. At a point on the screen directly in front of one of the slits, certain wavelengths are missing. Some of these missing wavelengths are :

1. \[\lambda=\frac{b^{2}}{d}\]

2. \[\lambda=\frac{2b^{2}}{d}\]

3. \[\lambda=\frac{3b^{2}}{d}\]

4. \[\lambda=\frac{2b^{2}}{3d}\]

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Question 36: easy

The first diffraction minimum due to a single slit diffraction is at θ = 30° for a light of wavelength 5000Å. The width of the slit is :

1. \[5\times 10^{-5} cm\]

2. \[1.0\times 10^{-4} cm\]

3. \[2.5\times 10^{-5} cm\]

4. \[1.25\times 10^{-5} cm\]

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