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Q. No.Light travels a distance \(x\) in time \(t_1\) in air and \(10x\) in time \(t_2\) in another denser medium. What is the critical angle for this medium?
1. \(\sin ^{-1}\left(\frac{10 t_1}{t_2}\right) \)
2. \(\sin ^{-1}\left(\frac{ t_2}{t_1}\right) \)
3. \(\sin ^{-1}\left(\frac{10 t_2}{t_1}\right) \)
4. \(\sin ^{-1}\left(\frac{ t_1}{10t_2}\right) \)
1. \(\sin ^{-1}\left(\frac{10 t_1}{t_2}\right) \)
2. \(\sin ^{-1}\left(\frac{ t_2}{t_1}\right) \)
3. \(\sin ^{-1}\left(\frac{10 t_2}{t_1}\right) \)
4. \(\sin ^{-1}\left(\frac{ t_1}{10t_2}\right) \)
Subtopic: Total Internal Reflection |
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In the figure shown here, what is the equivalent focal length of the combination of lenses? (Assume that all layers are thin)
1. \(-50~\mathrm{cm}\)
2. \(40~\mathrm{cm}\)
3. \(-40~\mathrm{cm}\)
4. \(-100~\mathrm{cm}\)
1. \(-50~\mathrm{cm}\)
2. \(40~\mathrm{cm}\)
3. \(-40~\mathrm{cm}\)
4. \(-100~\mathrm{cm}\)
Subtopic: Lenses |
From NCERT
NEET - 2023
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Two thin lenses are of same focal lengths (\(f\)), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be:
1. Infinite
2. zero
3. \(f/4\)
4. \(f/2\)
1. Infinite
2. zero
3. \(f/4\)
4. \(f/2\)
Subtopic: Lenses |
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NEET - 2023
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A lens is made up of 3 different transparent media as shown in the figure. A point object O is placed on its axis beyond 2f. How many real images will be obtained on the other side?
| 1. | 2 | 2. | 1 |
| 3. | No image will be formed | 4. | 3 |
Subtopic: Lenses |
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From NCERT
NEET - 2023
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A horizontal ray of light is incident on the right angled prism with prism angle \(6^\circ\). If the refractive index of the material of the prism is 1.5, then the angle of emergence will be:
1. \(9^\circ\)
2. \(10^\circ\)
3. \(4^\circ\)
4. \(6^\circ\)
1. \(9^\circ\)
2. \(10^\circ\)
3. \(4^\circ\)
4. \(6^\circ\)
Subtopic: Prisms |
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NEET - 2023
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Which set of colors will come out in air for a situation shown in figure?
| 1. | Yellow, Orange and Red | 2. | All |
| 3. | Orange, Red and Violet | 4. | Blue, Green and Yellow |
Subtopic: Total Internal Reflection |
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From NCERT
NEET - 2023
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An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance \(x\) in front of the second wall. The required focal length of the lens will be:
| 1. | less than \(\frac x4\) |
| 2. | more than \(\frac x4\) but less than \(\frac x2\) |
| 3. | \(\frac x2\) |
| 4. | \(\frac x4\) |
Subtopic: Refraction at Curved Surface |
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A biconvex lens has radii of curvature, \(20\) cm each. If the refractive index of the material of the lens is \(1.5,\) the power of the lens is:
1. infinity
2. \(+2\) D
3. \(+20\) D
4. \(+5\) D
1. infinity
2. \(+2\) D
3. \(+20\) D
4. \(+5\) D
Subtopic: Lenses |
69%
From NCERT
NEET - 2022
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A light ray falls on a glass surface of refractive index \(\sqrt{3}\), at an angle of \(60^\circ.\) The angle between the refracted and reflected rays would be:
1. \(120^\circ\)
2. \(30^\circ\)
3. \(60^\circ\)
4. \(90^\circ\)
1. \(120^\circ\)
2. \(30^\circ\)
3. \(60^\circ\)
4. \(90^\circ\)
Subtopic: Refraction at Plane Surface |
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Two transparent media \(\mathrm{A}\) and \(\mathrm{B}\) are separated by a plane boundary. The speed of light in those media are \(1.5\times 10^{8} \) m/s and \(2.0\times 10^{8} \) m/s, respectively. The critical angle for a ray of light for these two media is:
| 1. | \(\mathrm{tan^{-1}}\)(\(0.750\)) | 2. | \(\mathrm{sin^{-1}}\)(\(0.500\)) |
| 3. | \(\mathrm{sin^{-1}}\)(\(0.750\)) | 4. | \(\mathrm{tan^{-1}}\)(\(0.500\)) |
Subtopic: Total Internal Reflection |
76%
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NEET - 2022
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