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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 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 |

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 $\frac{{I}_{max}-{I}_{min}}{{I}_{max}+{I}_{min}}$ will be:

1. $\frac{\sqrt{n}}{n+1}$

2. $\frac{2\sqrt{n}}{n+1}$

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

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 I_{o}. 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 30^{o }when 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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