Unpolarised light is incident from the air on a plane surface of a material of refractive index 'μ'. 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 $\mathrm{i}={\mathrm{sin}}^{-1}\left(\frac{1}{\mathrm{\mu }}\right)$ 4 $\mathrm{i}={\mathrm{tan}}^{-1}\left(\frac{1}{\mathrm{\mu }}\right)$
Subtopic:  Polarization of Light |
58%
From NCERT
NEET - 2018
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In Young's double-slit experiment, the separation d between the slits is 2 mm, the wavelength $\lambda$ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same $\lambda$ and D) the separation between the slits needs to be changed to:-

1. 1.8 mm

2. 1.9 mm

3. 2.1 mm

3. 1.7 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 |
60%
From NCERT
NEET - 2017
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Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light of intensity $$I_0$$ is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle $$45^\circ$$ with that of P1. The intensity of transmitted light through P2 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 |
65%
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  will be:

1.  $\frac{\sqrt{n}}{n+1}$

2.  $\frac{2\sqrt{n}}{n+1}$

3.  $\frac{\sqrt{n}}{{\left(n+1\right)}^{2}}$

4.  $\frac{2\sqrt{n}}{{\left(n+1\right)}^{2}}$

Subtopic:  Superposition Principle |
72%
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 x 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 Io. 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 = 10d?

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 30when the light of wavelength 5000 Å is incident on the slit. The first secondary maximum is observed at an angle of:

$1.$ ${\mathrm{sin}}^{-1}\left(\frac{2}{3}\right)$

$2.$ ${\mathrm{sin}}^{-1}\left(\frac{1}{2}\right)$

$3.$ ${\mathrm{sin}}^{-1}\left(\frac{3}{4}\right)$

$4.$ ${\mathrm{sin}}^{-1}\left(\frac{1}{4}\right)$

Subtopic:  Diffraction |
70%
From NCERT
NEET - 2016
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