The Brewster's angle for an interface should be:
1. \(30^{\circ}<i_b<45^{\circ}\)
2. \(45^{\circ}<i_b<90^{\circ}\)
3. \(i_b=90^{\circ}\)
4. \(0^{\circ}<i_b<30^{\circ}\)

Subtopic:  Polarization of Light |
 73%
From NCERT
NEET - 2020
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In Young's double-slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes:

1. half 2. four times
3. one-fourth 4. double
Subtopic:  Young's Double Slit Experiment |
 81%
From NCERT
NEET - 2020
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Two coherent sources of light interfere and produce fringe patterns on a screen. For the central maximum, the phase difference between the two waves will be: 
1. zero 
2. \(\pi\)
3. \(\frac{3\pi}{2}\)
4. \(\frac{\pi}{2}\)

Subtopic:  Superposition Principle |
 72%
From NCERT
NEET - 2020
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The angular width of the central maximum in the Fraunhofer diffraction for \(\lambda=6000~\mathrm{\mathring{A}}\)  is \(\theta_0\). When the same slit is illuminated by another monochromatic light, the angular width decreases by \(30\%\). The wavelength of this light is:
1. \(1800~\mathrm{\mathring{A}}\)
2. \(4200~\mathrm{\mathring{A}}\)
3. \(420~\mathrm{\mathring{A}}\)
4. \(6000~\mathrm{\mathring{A}}\)

Subtopic:  Diffraction |
 75%
From NCERT
NEET - 2019
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In Young's double-slit experiment, if there is no initial phase difference between the light from the two slits, a point on the screen corresponding to the fifth minimum has a path difference:
1. \( \frac{5\lambda}{2} \)
2. \( \frac{10\lambda}{2} \)
3. \( \frac{9\lambda}{2} \)
4. \( \frac{11\lambda}{2} \)

Subtopic:  Young's Double Slit Experiment |
 76%
From NCERT
NEET - 2019
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For a crystal with λ = 1 Å and Bragg's angle θ = 60°, the second-order diffraction, 'd' (distance between two consecutive atomic layers) will be:
1.  1.15 Å
2.  0.75 Å
3.  0.55 Å
4.  2.1 Å

Subtopic:  Diffraction |
 52%
From NCERT
AIPMT - 1998
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The interplanar distance in a crystal is \(2.8 \times 10^{-8} \) m. The value of the maximum wavelength which can be diffracted:

1. \(2.8 \times 10^{-8} \) m

2. \(5.6 \times 10^{-8} \) m

3. \(1.4 \times 10^{-8} \) m

4. \(7.6 \times 10^{-8} \) m

Subtopic:  Diffraction |
From NCERT
AIPMT - 2001
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In a double-slit experiment, when the light of wavelength \(400~\text{nm}\) was used, the angular width of the first minima formed on a screen placed \(1~\text{m}\) away, was found to be \(0.2^{\circ}\). What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? \(\left(\mu_{\text{water}} = \frac{4}{3}\right)\)
1. \(0.1^{\circ}\)
2. \(0.266^{\circ}\)
3. \(0.15^{\circ}\)
4. \(0.05^{\circ}\)

Subtopic:  Young's Double Slit Experiment |
 75%
From NCERT
NEET - 2019
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Two periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is:

1.  2l1+l2

2.  I1+l22

3.  I1-l22

4.  2I1-l2

Subtopic:  Superposition Principle |
 74%
From NCERT
AIPMT - 2008
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A parallel beam of fast-moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct?
1. The angular width of the central maximum of the diffraction pattern will increase.
2. The angular width of the central maximum will decrease.
3. The angular width of the central maximum will be unaffected.
4. A diffraction pattern is not observed on the screen in the case of electrons.
Subtopic:  Diffraction |
 52%
From NCERT
AIPMT - 2013
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