# In Young’s double-slit experiment using monochromatic light of wavelength $$\lambda,$$ the intensity of light at a point on the screen where path difference $$\lambda$$ is $$K$$ units. What is the intensity of the light at a point where path difference is $$\lambda/3$$? 1. $$\frac K3$$ 2. $$\frac K4$$ 3. $$\frac K2$$ 4. $$K$$

Subtopic:  Superposition Principle |
63%
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In a double-slit experiment the angular width of a fringe is found to be $$0.2^\circ$$ on a screen placed $$1$$ m away. The wavelength of light used is $$600$$ nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water?
(Take the refractive index of water to be $$4/3$$).
1. $$0.33^\circ$$
2. $$0.20^\circ$$
3. $$0.15^\circ$$
4. $$0.10^\circ$$

Subtopic:  Young's Double Slit Experiment |
82%
From NCERT
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What is the Brewster angle for air to glass transition? (Refractive index of glass = 1.5.)

1. $49.{29}^{0}$
2. $43.{21}^{0}$
3. $50.{30}^{0}$
4. $56.{31}^{0}$

Subtopic:  Polarization of Light |
58%
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What is the distance for which ray optics is a good approximation for an aperture of 4 mm and wavelength 400 nm?

1. 40 m
2. 30 m
3. 20 m
4. 50 m

Subtopic:  Diffraction |
68%
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When the light diverges from a point source, the shape of the wavefront is:

1. Parabolic.

2. Plane.

3. Spherical.

4. Elliptical.

Subtopic:  Huygens' Principle |
83%
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When the light is coming from a distant star that is intercepted by the earth, the shape of the wavefront is:

1. Spherical.
2. Plane.
3. Elliptical.
4. None of these.

Subtopic:  Huygens' Principle |
66%
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Which of the following is not true?

 1 The speed of light is dependent on the colour of the light. 2 The speed of violet light is less than the speed of the red light in glass. 3 The frequency of light never depends upon the property of the medium. 4 When the light diverges from a point source, the shape of the wavefront is plane.
Subtopic:  Huygens' Principle |
73%
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A beam of light consisting of two wavelengths, 650 nm, and 520 nm, is used to obtain interference fringes in Young’s double-slit experiment. What is the distance of the third bright fringe on the screen from the central maximum for wavelength 650 nm?
1. $$1950 \frac{\mathrm{D}}{\mathrm{d}} \mathrm{nm}$$
2. $$1700 \frac{\mathrm{D}}{\mathrm{d}} \mathrm{nm}$$
3. $$1100 \frac{\mathrm{D}}{\mathrm{d}} \mathrm{nm}$$
4. $$1861 \frac{D}{d} n m$$

Subtopic:  Young's Double Slit Experiment |
72%
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In deriving the single slit diffraction pattern, at which angles the intensity is zero?
1. $$\frac{2 n \lambda}{a}$$
2. $$\frac{n \lambda}{a}$$
3. $$\frac{n \lambda}{2 a}$$
4. $$0$$

Subtopic:  Diffraction |
53%
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A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the center of the screen. The width of the slit is:

1. 0.43 mm
2. 0.57 mm
3. 0.13 mm
4. 0.2 mm

Subtopic:  Diffraction |
66%
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