Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is :

1. $1.83\times {10}^{-7}rad$

2. $7.32\times {10}^{-7}rad$

3. $6.00\times {10}^{-7}rad$

4. $3.66\times {10}^{-7}rad$

Subtopic: Resolving Power of Optical Devices |

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In Young's double-slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes:

1. half

2. four times

3. one-fourth

4. double

Subtopic: Young's Double Slit Experiment |

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The Brewster's angle for an interface should be:

1. 30° < ${\mathrm{i}}_{\mathrm{b}}$ <45°

2. 45° < ${\mathrm{i}}_{\mathrm{b}}$ < 90°

3. ${\mathrm{i}}_{\mathrm{b}}$ = 90°

4. 0° < ${\mathrm{i}}_{\mathrm{b}}$ < 30°

Subtopic: Polarization of Light |

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Two coherent sources of light interfere and produce fringe pattern on a screen. For the central maximum, the phase difference between the two waves will be:

1. zero

2. $\pi $

3. $3\pi /2$

4. $\pi /2$

Subtopic: Superposition Principle |

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In a double-slit experiment, when the light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be 0.2$\xb0$. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? $\left({\mu}_{water}=4/3\right)$

1. 0.1$\xb0$

2. 0.266$\xb0$

3. 0.15$\xb0$

4. 0.05$\xb0$

Subtopic: Young's Double Slit Experiment |

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In Young's double-slit experiment, if there is no initial phase difference between the light from the two slits, a point on the screen corresponding to the fifth minimum has path difference :

1. $5\frac{\lambda}{2}$

2. $10\frac{\lambda}{2}$

3. $9\frac{\lambda}{2}$

4. $11\frac{\lambda}{2}$

Subtopic: Young's Double Slit Experiment |

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The angular width of the central maximum in the Fraunhofer diffraction for $\lambda =6000\stackrel{o}{A}is{\theta}_{0}$. When the same slit is illuminated by another monochromatic light, the angular width decreases by 30%. The wavelength of this light is:

1. $1800\stackrel{o}{A}$

2. $4200\stackrel{o}{A}$

3. $420\stackrel{o}{A}$

4. $6000\stackrel{o}{A}$

Subtopic: Diffraction |

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In a Young's double slit experiment, a student observes 8 fringes in a certain segment of screen when a monochromatic light of 600 nm wavelength is used. If the wavelength of light is changed to 400 nm, then the number of fringes he would observe in the same region of the screen is:

1. 12

2. 6

3. 8

4. 9

1. 12

2. 6

3. 8

4. 9

Subtopic: Young's Double Slit Experiment |

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A linearly polarized monochromatic light of intensity 10 lumen is incident on a polarizer. The angle between the direction of polarization of the light and that of the polarizer such that the intensity of output light is 2.5 lumen is:

1. 60°

2. 75°

3. 30°

4. 45°

Subtopic: Polarization of Light |

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A monochromatic light of frequency 500 THz is incident on the slits of a Young's double slit experiment. If the distance between the slits is 0.2 mm and the screen is placed at a distance 1 m from the slits, the width of 10 fringes will be:

1. 1.5 mm

2. 15 mm

3. 30 mm

4. 3 mm

Subtopic: Young's Double Slit Experiment |

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