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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 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. \({\dfrac{\sqrt5}{4}}\)
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 eye piece of focal length \(5.0~\text{cm}\) The magnifying power of 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 |
64%
From NCERT
NEET - 2024
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If \(i\) is the angle of incidence and \(i'\) is the angle of emergence on a prism, then the relation between \(i\) and \(i'\) to obtain an angle of minimum deviation 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 |
76%
From NCERT
NEET - 2024
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The graph which shows the correct variation of \(\large\frac{1}{v}\) with \(\large\frac{1}{u}\) 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 |
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 |
69%
From NCERT
NEET - 2024
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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. \(\sin ^{-1}\left(\dfrac{10 t_1}{t_2}\right) \)
2. \(\sin ^{-1}\left(\dfrac{ t_2}{t_1}\right) \)
3. \(\sin ^{-1}\left(\dfrac{10 t_2}{t_1}\right) \)
4. \(\sin ^{-1}\left(\dfrac{ t_1}{10t_2}\right) \)
1. \(\sin ^{-1}\left(\dfrac{10 t_1}{t_2}\right) \)
2. \(\sin ^{-1}\left(\dfrac{ t_2}{t_1}\right) \)
3. \(\sin ^{-1}\left(\dfrac{10 t_2}{t_1}\right) \)
4. \(\sin ^{-1}\left(\dfrac{ t_1}{10t_2}\right) \)
Subtopic: Total Internal Reflection |
62%
From NCERT
NEET - 2023
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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. \(-50~\text{cm}\)
2. \(40~\text{cm}\)
3. \(-40~\text{cm}\)
4. \(-100~\text{cm}\)
1. \(-50~\text{cm}\)
2. \(40~\text{cm}\)
3. \(-40~\text{cm}\)
4. \(-100~\text{cm}\)
Subtopic: Lens Makers' Formula |
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 |
57%
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 |
60%
From NCERT
NEET - 2023
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