Light travels faster in the air than in glass. This is in accordance with:
1. | the wave theory of light. |
2. | the corpuscular theory of light. |
3. | neither (1) nor (2) |
4. | both (1) and (2) |
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In Young's double-slit experiment, the slit separation is doubled. This results in:
1. | An increase in fringe intensity |
2. | A decrease in fringe intensity |
3. | Halving of the fringe spacing |
4. | Doubling of the fringe spacing |
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In Young's double-slit experiment the light emitted from the source has = 6.5 × 10–7 m and the distance between the two slits is 1 mm. The distance between the screen and slits is 1 metre. Distance between third dark and fifth bright fringe will be:
1. 3.2 mm
2. 1.63 mm
3. 0.585 mm
4. 2.31 mm
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A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central bright band is:
1. 3 mm
2. 9 mm
3. 4.5 mm
4. 1.5 mm
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In Young’s double slit experiment, the slits are \(2~\text{mm}\) apart and are illuminated by photons of two wavelengths \(\lambda_1 = 12000~\mathring{\text{A}}\) and \(\lambda_2 = 10000~\mathring{\text{A}}\). At what minimum distance from the common central bright fringe on the screen, \(2~\text{m}\) from the slit, will a bright fringe from one interference pattern coincide with a bright fringe from the other?
1. \(6~\text{mm}\)
2. \(4~\text{mm}\)
3. \(3~\text{mm}\)
4. \(8~\text{mm}\)
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A beam of light of \(\lambda = 600~\text{nm}\) from a distant source falls on a single slit \(1~\text{mm}\) wide and the resulting diffraction pattern is observed on a screen \(2~\text{m}\) away. The distance between the first dark fringes on either side of the central bright fringe is:
1. \(1.2~\text{cm}\)
2. \(1.2~\text{mm}\)
3. \(2.4~\text{cm}\)
4. \(2.4~\text{mm}\)
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In a diffraction pattern due to a single slit of width \(a\), the first minimum is observed at an angle of \(30^{\circ}\) when the light of wavelength \(5000~\mathring{\text{A}}\) is incident on the slit. The first secondary maximum is observed at an angle of:
1. \(\text{sin}^{-1}\frac{2}{3}\)
2. \(\text{sin}^{-1}\frac{1}{2}\)
3. \(\text{sin}^{-1}\frac{3}{4}\)
4. \(\text{sin}^{-1}\frac{1}{4}\)
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In Young's double-slit experiment, the ratio of intensities of bright and dark fringes is 9. This means that:
1. | the intensities of individual sources are 5 and 4 units respectively. |
2. | the intensities of individual sources are 4 and 1 unit respectively. |
3. | the ratio of their amplitudes is 3. |
4. | the ratio of their amplitudes is 6. |
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Two superposing waves are represented by the following equations:
\({\mathrm{y}_1=5 \sin 2 \pi(10 \mathrm{t}-0.1 \mathrm{x}), \mathrm{y}_2=10 \sin 2 \pi(10 \mathrm{t}-0.1 \mathrm{x}).}\)
Ratio of intensities will be:
1. 1
2. 9
3. 4
4. 16
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Two polaroids are kept crossed to each other. Now one of them is rotated through an angle of . The percentage of incident light now transmitted through the system is:
1. 15%
2. 25%
3. 50%
4. 60%
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