51. |
Two Nicol prisms are first crossed and then one of them is rotated through 60°. The percentage of incident light transmitted is _____ .
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Answer:
Option (c) |
52. |
In Young's double slit experiment the y co-ordinates of first minimum and 10th maxima are 3 cm and 6 cm respectively. When the YDSE apparatus is immersed in a liquid of refractive index 1.5, the corresponding y co-ordinates will be _____ .
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Answer:
Option (c) |
53. |
The resolving power of telescope depends upon _____ .
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Answer:
Option (d) |
54. |
Large aperture telescope are used for _____ .
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Answer:
Option (a) |
55. |
To increase both the resolving power and magnifying power of a telescope _____.
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Answer:
Option (d) |
56. |
The distance between two slits in an Young's experiment is 0.2 mm. If the wavelength of light used is 5000 Å, the angular positioned of bright fringe from the central bright fringe is _____ rad.
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Answer:
Option (c) |
57. |
In Young's experiment the distance between two slits is 0.4 cm and the distance of the screen from the slits is 100 cm. If the wavelength of light used is 5000 Å, the distance of 4th dark fringe from the central bright fringe is _____
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Answer:
Option (a) |
58. |
The distance between two slits in Young's experiment is 0.1 mm and the distance of the screen from the slits is 100 cm. If the wavelength of light used is 5000 Å, the width of the fringe is _____
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Answer:
Option (b) |
59. |
In Young's experiment the distance between the two slits is halved and the distance between the screen and slits is doubled. The width of the fringe _____
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Answer:
Option (d) |
60. |
A diffraction is formed with red light. If red light is replaced by blue light, _____
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Answer:
Option (b) |