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Light is:

1. | a wave phenomenon |

2. | a particle phenomenon |

3. | both particle and wave phenomenon |

4. | none of the above |

Subtopic: Â Diffraction |

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Sound waves travel faster in water than in air. Imagine a plane sound wavefront incident at an angle \(\alpha\) at the air-water interface; the refracted wavefront making an angle \(\beta\) with the interface. Then,

1. | \(\alpha>\beta\) |

2. | \(\beta>\alpha\) |

3. | \(\alpha=\beta\) |

4. | \(\alpha~\&~\beta \) cannot be predicted. | the relation between

Subtopic: Â Huygens' Principle |

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When light is refracted into a medium then,

1. | its wavelength and frequency both increase. |

2. | its wavelength increases but frequency remains unchanged. |

3. | its wavelength decreases but frequency remains unchanged. |

4. | its wavelength and frequency both decrease. |

Subtopic: Â Huygens' Principle |

Â 76%

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The wavefronts of light coming from a distant source of unknown shape are nearly:

1. plane

2. elliptical

3. cylindrical

4. spherical

Subtopic: Â Huygens' Principle |

Â 67%

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For light diverging from a point source:

(a) | the wavefront is spherical. |

(b) | the intensity decreases in proportion to the distance squared. |

(c) | the wavefront is parabolic. |

(d) | the intensity at the wavefront does not depend on the distance. |

1. | (a), (b) | 2. | (a), (c) |

3. | (b), (c) | 4. | (c), (d) |

Subtopic: Â Huygens' Principle |

Â 82%

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Plane waves of light of wavelength \(\lambda\) are incident onto a convex lens, and the beam is brought to a focus. A plane slab of thickness \(t\) having refractive indices \(\mu_1,~\mu_2\) in the upper and lower halves is placed parallel to the incoming wavefronts. The phase difference between the wavefronts at the focus, coming from the upper and lower halves of the slab is:

1. \(\dfrac{2 \pi}{\lambda}\left[\left(\mu_{1}-1\right) t+\left(\mu_{2}-1\right) t\right]\)

2. \(\dfrac{2 \pi}{\lambda}\left(\mu_{1}-\mu_{2}\right) t\)

3. \(\dfrac{2 \pi}{\lambda}\left(\dfrac{t}{\mu_{1}}-\dfrac{t}{\mu_{2}}\right)\)

4. \(\dfrac{2 \pi}{\lambda}\left(\dfrac{t}{\mu_{1}}+\dfrac{t}{\mu_{2}}\right)\)

1. \(\dfrac{2 \pi}{\lambda}\left[\left(\mu_{1}-1\right) t+\left(\mu_{2}-1\right) t\right]\)

2. \(\dfrac{2 \pi}{\lambda}\left(\mu_{1}-\mu_{2}\right) t\)

3. \(\dfrac{2 \pi}{\lambda}\left(\dfrac{t}{\mu_{1}}-\dfrac{t}{\mu_{2}}\right)\)

4. \(\dfrac{2 \pi}{\lambda}\left(\dfrac{t}{\mu_{1}}+\dfrac{t}{\mu_{2}}\right)\)

Subtopic: Â Huygens' Principle |

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Two sources are called coherent if they produce waves:

1. | of equal wavelength |

2. | of equal velocity |

3. | having same shape of wavefront |

4. | having a constant phase difference |

Subtopic: Â Young's Double Slit Experiment |

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Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is \(25.\) The intensities of the sources are in the ratio:

1. \(25:1\)

2. \(5:1\)

3. \(9:4\)

4. \(625:1\)

Subtopic: Â Young's Double Slit Experiment |

Â 80%

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The slits in a Young's double-slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is \(I_0.\) If one of the slits is closed, the intensity at this point will be:

1. \(I_0\)

2. \(I_0/4\)

3. \(I_0/2\)

4. \(4I_0\)

Subtopic: Â Young's Double Slit Experiment |

Â 62%

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Find the minimum order of a green fringe (\(\lambda = 500\) nm) which overlaps a dark fringe of violet (\(\lambda = 400\) nm) in a Young's double-slit experiment conducted with these two colours.

1. \(4\)

2. \(2\)

3. \(5\)

4. \(2.5\)

1. \(4\)

2. \(2\)

3. \(5\)

4. \(2.5\)

Subtopic: Â Young's Double Slit Experiment |

Â 53%

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