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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. | $\mathrm{}$\(i = \text{sin}^{-1}\frac{1}{\mu}\) |

4. | \(i = \text{tan}^{-1}\frac{1}{\mu}\)$\mathrm{}$ |

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. \(1.25\)

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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