In a diffraction pattern due to a single slit of width a,the first minimum is observed at an angle 30 when light of wavelength 5000 A˙ is incident on the slit. The first secondary maximum is observed at an angle of 

1. sin-123           
2. sin-112
3. sin-134           
4. sin-114

Subtopic:  Diffraction |
 65%
From NCERT
NEET - 2016
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For a parallel beam of monochromatic light of wavelength diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of the light. If 'D' is the distance of the screen from the slit, the width of the central maxima will be

(1)2Dλ/a

(2)Dλ/a

(3)Da/λ

(4)2Da/λ

Subtopic:  Diffraction |
 79%
From NCERT
NEET - 2015
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A beam of light of 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is
                      
1. 1.2cm

2. 1.2mm

3. 2.4cm

4. 2.4mm

Subtopic:  Diffraction |
 59%
From NCERT
NEET - 2014
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In Young’s double slit experiment. the slits are 2 mm apart and are illuminated by photons of two wavelengths , λ1= 12000Å and , λ2= 10000Å. At what minimum distance from the common central bright fringe on the screen 2m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?

(a) 8mm

(b) 6mm

(c) 4 mm

(d) 3mm

Subtopic:  Young's Double Slit Experiment |
 75%
From NCERT
NEET - 2013
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The ratio of resolving powers of an optical microscope for two wavelengths λ1=4000 A0 and λ2=6000 A0 is:

1. 9:4

2. 3:2

3. 16:81

4. 8:27

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
 76%
From NCERT
NEET - 2017
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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 |
 63%
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. \(\dfrac{I_0}{4}\)

2. \(\dfrac{I_0}{8}\)

3. \(\dfrac{I_0}{16}\)

4. \(\dfrac{I_0}{2}\)

Subtopic:  Polarization of Light |
 67%
From NCERT
NEET - 2017
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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 |
 70%
From NCERT
NEET - 2016
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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 |
 61%
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 \(5896~\mathring{A}\) 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 |
 76%
From NCERT
NEET - 2018
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