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Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light of intensity Io is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45° with that of P1. The intensity of transmitted light through P2 is:
1.
2.
3.
4.
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The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio will be
1.
2.
3.
4.
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 center of the screen is:
1. 0.10 cm
2. 0.25 cm
3. 0.20 cm
4. 0.15 cm
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In Young's double-slit experiment, the separation d between the slits is 2 mm, the wavelength 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 and D) the separation between the slits needs to be changed to:
1. 1.8 mm
2. 1.9 mm
3. 2.1 mm
4. 1.7 mm
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An astronomical refracting telescope will have large angular magnification and high angular resolution when it has an objective lens of:
1. | Small focal length and large diameter |
2. | Large focal length and small diameter |
3. | Large focal length and large diameter |
4. | Small focal length and small diameter |
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The intensity at the maximum in a Young's double-slit experiment is I0. Distance between two slits is d = 5, where 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.
2.
3.
4.
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Two slits in young’s experiment have widths in the ratio 1:25. The ratio of intensity at the maxima and minima in the interference pattern is
1.
2.
3.
4.
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At the first minimum adjacent to the central maximum of a single slit diffraction pattern, the phase difference between the Huygen’s wavelet from the edge of the slit and the wavelet from the midpoint of the slit is:
1. \(\frac{\pi}{4}~radian\)
2. \(\frac{\pi}{2}~radian\)
3. \(\pi~radian\)
4. \(\frac{\pi}{8}~radian\)
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.