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Q. No.A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is
1. blue.
2. green.
3. violet.
4. red.
1. blue.
2. green.
3. violet.
4. red.
Subtopic: Â Refraction at Plane Surface |
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From NCERT
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The optical density of turpentine is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in Figure, the path shown is correct?
1. \(1\)
2. \(2\)
3. \(3\)
4. \(4\)
1. \(1\)
2. \(2\)
3. \(3\)
4. \(4\)
Subtopic: Â Refraction at Plane Surface |
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From NCERT
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There are certain material developed in laboratories which have a negative refractive index (see figure). A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given by,
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Â Refraction at Plane Surface |
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From NCERT
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Consider a ray of light incident from 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. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\pi \)
2. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2} \)
3. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\dfrac{\pi}{2} \)
4. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+2 \pi\)
1. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\pi \)
2. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2} \)
3. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\dfrac{\pi}{2} \)
4. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+2 \pi\)
Subtopic: Â Refraction at Plane Surface |
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