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Q. No.A light ray enters through a right-angled prism at point \(P\) with the angle of incidence \(30^\circ\) as shown in the figure. It travels through the prism parallel to its base \(BC\) and emerges along the face \(AC.\) The refractive index of the prism is:
1.
\({\dfrac{\sqrt5}{2}}\)
2.
\({\dfrac{\sqrt3}{4}}\)
3.
\({\dfrac{\sqrt3}{2}}\)
4.
\({\dfrac{\sqrt5}{4}}\)
Subtopic: Prisms |
From NCERT
NEET - 2024
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A small telescope has an objective of focal length \(140~\text{cm}\) and an eyepiece of focal length \(5.0~\text{cm}\) The magnifying power of a telescope for viewing a distant object is:
1. \(28\)
2. \(17\)
3. \(32\)
4. \(34\)
1. \(28\)
2. \(17\)
3. \(32\)
4. \(34\)
Subtopic: Telescope |
67%
From NCERT
NEET - 2024
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For a prism, when the light undergoes minimum deviation, the relationship between the angle of incidence \((i)\) and the angle of emergence \((i')\) is:
1. \(i=i'\)
2. \(i>i'\)
3. \(i<i'\)
4. \(i=0\)
1. \(i=i'\)
2. \(i>i'\)
3. \(i<i'\)
4. \(i=0\)
Subtopic: Prisms |
82%
From NCERT
NEET - 2024
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The graph which shows the correct variation of \(\dfrac{1}{v}\) with \(\dfrac{1}{u}\) for a concave mirror, where \(u\) is the object distance and \(v\) is the image distance, is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Reflection at Spherical Surface |
52%
From NCERT
NEET - 2024
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Time taken by sunlight to pass through a glass slab of thickness \(5~\text{mm}\) and refractive index \(1.5\) is:
1. \(\left(\dfrac{5}{3}\right) \times 10^{-8}~\text{s}\)
2. \(\left(\dfrac{5}{2}\right) \times 10^{-11}~\text{s}\)
3. \(\left(\dfrac{5}{3}\right) \times 10^{-11}~\text{s}\)
4. \(\left(\dfrac{5}{2}\right)\times 10^{-8}~\text{s}\)
1. \(\left(\dfrac{5}{3}\right) \times 10^{-8}~\text{s}\)
2. \(\left(\dfrac{5}{2}\right) \times 10^{-11}~\text{s}\)
3. \(\left(\dfrac{5}{3}\right) \times 10^{-11}~\text{s}\)
4. \(\left(\dfrac{5}{2}\right)\times 10^{-8}~\text{s}\)
Subtopic: Refraction at Plane Surface |
73%
From NCERT
NEET - 2024
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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 \(\dfrac x4\) |
| 2. | more than \(\dfrac x4\) but less than \(\dfrac x2\) |
| 3. | \(\dfrac x2\) |
| 4. | \(\dfrac x4\) |
Subtopic: Refraction at Curved Surface |
63%
From NCERT
NEET - 2023
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Which set of colours would be observed in the air under the conditions depicted in the figure?
| 1. | yellow, orange, and red |
| 2. | blue, green, and yellow |
| 3. | orange, red, and violet |
| 4. | all of the above |
Subtopic: Total Internal Reflection |
72%
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 |
56%
From NCERT
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. \(3\)
1. \(2\)
2. \(1\)
3. No image will be formed
4. \(3\)
Subtopic: Lenses |
62%
From NCERT
NEET - 2023
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Two thin lenses are of the 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 |
59%
From NCERT
NEET - 2023
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