Unpolarised light is incident from the air on a plane surface of a material of refractive index \(\mu\). At a particular angle of incidence \(i\), it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?

1. the reflected light is polarised with its electric vector parallel to the plane of incidence.
2. the reflected light is polarised with its electric vector perpendicular to the plane of incidence.
3. \(i = \text{sin}^{-1}\frac{1}{\mu}\)
4. \(i = \text{tan}^{-1}\frac{1}{\mu}\)
Subtopic:  Polarization of Light |
 59%
From NCERT
NEET - 2018
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In Young's double-slit experiment, the separation \(d\) between the slits is \(2~\text{mm}\), the wavelength \(\lambda\) of the light used is \(5896~\mathring{\text{A}}\) and distance \(D\) between the screen and slits is \(100~\text{cm}\). It is found that the angular width of the fringes is \(0.20^{\circ}\). To increase the fringe angular width to \(0.21^{\circ}\) (with same \(\lambda\) and \(D\)) the separation between the slits needs to be changed to:
1. \(1.8~\text{mm}\)
2. \(1.9~\text{mm}\)
3. \(2.1~\text{mm}\)
4. \(1.7~\text{mm}\)

Subtopic:  Young's Double Slit Experiment |
 75%
From NCERT
NEET - 2018
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Young’s double-slit experiment is first performed in air and then in a medium other than air. It is found that the \(8^\mathrm{th}\) bright fringe in the medium lies where the \(5^\mathrm{th}\) dark fringe lies in the air. The refractive index of the medium is nearly:
1. \(1.59\)
2. \(1.69\)
3. \(1.78\)
4. \(1.25\)  
Subtopic:  Young's Double Slit Experiment |
 61%
From NCERT
NEET - 2017
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Two polaroids \(P_1\) and \(P_2\) are placed with their axis perpendicular to each other. Unpolarised light of intensity \(I_0\) is incident on \(P_1\). A third polaroid \(P_3\) is kept in between \(P_1\) and \(P_2\) such that its axis makes an angle \(45^\circ\) with that of \(P_1\). The intensity of transmitted light through \(P_2\) is:
1. \(\frac{I_0}{4}\)
2. \(\frac{I_0}{8}\)
3. \(\frac{I_0}{16}\)
4. \(\frac{I_0}{2}\)

Subtopic:  Polarization of Light |
 66%
From NCERT
NEET - 2017
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An interference pattern is obtained with two coherent light sources of intensity ratio \(n.\) In the interference pattern, the ratio \(\frac{I_{max}-I_{min}}{I_{max}+I_{min}}\) will be:
1. \(\frac{\sqrt{n}}{n+1}\)
2. \(\frac{2\sqrt{n}}{n+1}\)
3. \(\frac{\sqrt{n}}{(n+1)^2}\)
4. \(\frac{2\sqrt{n}}{(n+1)^2}\)

Subtopic:  Superposition Principle |
 73%
From NCERT
NEET - 2016
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A linear aperture whose width is \(0.02\) cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength \(5\times 10^{-5}\) cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is:
1. \( 0.10 \) cm
2. \( 0.25 \) cm
3. \( 0.20 \) cm
4. \( 0.15\) cm

Subtopic:  Diffraction |
 68%
From NCERT
NEET - 2016
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The intensity at the maximum in Young's double-slit experiment is \(I_0\). The distance between the two slits is  \(d= 5\lambda\),  where \(\lambda \) is the wavelength of light used in the experiment. What will be the intensity in front of one of the slits on the screen placed at a distance \(D = 10 d\)?
1. \(\frac{I_0}{4}\)
2. \(\frac{3}{4}I_0\)
3. \(\frac{I_0}{2}\)
4. \(I_0\)

Subtopic:  Young's Double Slit Experiment |
 59%
From NCERT
NEET - 2016
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In a diffraction pattern due to a single slit of width \(a\), the first minimum is observed at an angle of \(30^{\circ}\) when the light of wavelength \(5000~\mathring{\text{A}}\) is incident on the slit. The first secondary maximum is observed at an angle of:
1. \(\text{sin}^{-1}\frac{2}{3}\)
2. \(\text{sin}^{-1}\frac{1}{2}\)
3. \(\text{sin}^{-1}\frac{3}{4}\)
4. \(\text{sin}^{-1}\frac{1}{4}\)

Subtopic:  Diffraction |
 72%
From NCERT
NEET - 2016
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