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Q. No.When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of:
| 1. | dispersion of light | 2. | reflection of light |
| 3. | polarization of light | 4. | interference of light |
A. \(y=a\sin\omega t\)
B. \(y=a\sin2\omega t\)
C. \(y=a\sin\left(\omega t-\phi\right)\)
D. \(y=a\sin3\omega t\)
Choose the correct answer from the options given below:
| 1. | B and C | 2. | B and D |
| 3. | A and C | 4. | A and B |
(where \(\lambda\) is the wavelength of these waves).
1. \(0\)
2. \(2\)
3. \(4\)
4. \(0.5\)
Consider a ray of light incident from the air onto a slab of glass (refractive index \(n\)) of width \(d\), at an angle \(\theta\). The phase difference between the ray reflected by the top surface of the glass and the bottom surface is:
1. \(\frac{4 \pi d}{\lambda}\left(1-\frac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\pi\)
2. \(\frac{4 \pi d}{\lambda}\left(1-\frac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}\)
3. \(\frac{4 \pi d}{\lambda}\left(1-\frac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\frac{\pi}{2}\)
4. \(\frac{4 \pi d}{\lambda}\left(1-\frac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+2\pi\)
| 1. | is conserved, gets redistributed |
| 2. | is equal at every point |
| 3. | is not conserved |
| 4. | is created in place of bright fringes |
In Young’s double-slit experiment using monochromatic light of wavelength \(\lambda,\) the intensity of light at a point on the screen where path difference \(\lambda\) is \(K\) units. What is the intensity of the light at a point where path difference is \(\lambda/3\)?
1. \(\dfrac K3\)
2. \(\dfrac K4\)
3. \(\dfrac K2\)
4. \(K\)
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Q. No.
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