Q. No.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. \(\frac{\pi}{8}~radian\)
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In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. Monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double-slit within the central maxima of a single-slit pattern?
1. 0.2 mm
2. 0.1 mm
3. 0.5 mm
4. 0.02 mm
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A beam of light of λ = 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is :
1. 1.2 cm
2. 1.2 mm
3. 2.4 cm
4. 2.4 mm
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In Young's double-slit experiment, the intensity of light at a point on the screen where the path difference is λ is K, (λ being the wavelength of light used). The intensity at a point where the path difference is λ/4 will be:
1. K
2. K/4
3. K/2
4. Zero
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2. 4 mm
3. 3 mm
4. 8 mm
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