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Q. No.Two plane mirrors are inclined at \(70^\circ.\) A ray incident on one mirror at an angle \(\theta\) after reflection falls on the second mirror and is reflected from there parallel to the first mirror. The value of \(\theta\) is:
1.
\(45^\circ\)
2.
\(30^\circ\)
3.
\(55^\circ\)
4.
\(50^\circ\)
Subtopic: Reflection at Plane Surface |
54%
Level 3: 35%-60%
NEET - 2013
Hints
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 |
76%
Level 2: 60%+
NEET - 2023
Hints
The reddish appearance of the sun at sunrise and sunset is due to:
| 1. | the scattering of light. |
| 2. | the polarisation of light. |
| 3. | the colour of the sun. |
| 4. | the colour of the sky. |
Subtopic: Total Internal Reflection |
89%
Level 1: 80%+
NEET - 2013
Hints
An observer is using an astronomical refracting telescope to observe planets in normal adjustment. The focal lengths of the objective and eyepiece used in the telescope construction are \(20\text{m}\) and \(2\text{cm}\) respectively. Consider the following statements about the telescope:
The correct statements are:
| (A) | the distance between the objective and the eyepiece is \(20.02\text{m}.\) |
| (B) | the magnification of the telescope is \(-1000\). |
| (C) | the image of the planet is erect and diminished. |
| (D) | the aperture of the eyepiece is smaller than that of the objective. |
The correct statements are:
| 1. | A, B, and C | 2. | B, C, and D |
| 3. | C, D, and A | 4. | A, B, and D |
Subtopic: Telescope |
68%
Level 2: 60%+
NEET - 2022
Hints
A ray of light is incident on a mirror which is lying on the \(x\text-y\) plane. The reflected ray travels along the direction of the vector \(3\hat i-4\hat j+2\hat k. \) The incident ray must be along:
1. \(-3\hat i+4\hat j+2\hat k\)
2. \(3\hat i-4\hat j-2\hat k\)
3. \(-3\hat i-4\hat j+2\hat k\)
4. \(-3\hat i+4\hat j-2\hat k\)
1. \(-3\hat i+4\hat j+2\hat k\)
2. \(3\hat i-4\hat j-2\hat k\)
3. \(-3\hat i-4\hat j+2\hat k\)
4. \(-3\hat i+4\hat j-2\hat k\)
Subtopic: Reflection at Plane Surface |
Level 3: 35%-60%
Hints
A beam of light is incident vertically on a glass slab of thickness \(1~\text{cm},\) and refractive index \(1.5.\) A fraction \(A\) is reflected from the front surface while another fraction \(B\) enters the slab and emerges after reflection from the back surface. The time delay between them is:
1. \(10^{-10}~\text{s}\)
2. \(5\times 10^{-10}~\text{s}\)
3. \(10^{-11}~\text{s}\)
4. \(5\times 10^{-11}~\text{s}\)
Subtopic: Refraction at Plane Surface |
59%
Level 3: 35%-60%
NEET - 2022
Hints
A concave lens with a focal length of \(-25~\text{cm}\) is sandwiched between two convex lenses, each with a focal length of \(40~\text{cm}.\) The power (in diopters) of the combined lens system would be:
| 1. | \(55\) | 2. | \(9\) |
| 3. | \(1\) | 4. | \(0.01\) |
Subtopic: Lenses |
69%
Level 2: 60%+
NEET - 2022
Hints
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. | \(90^\circ\) |
Subtopic: Refraction at Plane Surface |
62%
Level 2: 60%+
NEET - 2022
Hints
A biconvex lens has radii of curvature, \(20~\text{cm}\) each. If the refractive index of the material of the lens is \(1.5,\) the power of the lens is:
| 1. | infinity | 2. | \(+2~\text{D}\) |
| 3. | \(+20 ~\text{D}\) | 4. | \(+5~\text{D}\) |
Subtopic: Lenses |
73%
Level 2: 60%+
NEET - 2022
Hints
A ray is incident normally onto the surface \(AB\) of the prism \((\angle A=30^\circ,\angle B=90^\circ).\) The refractive index of the material of the prism is \(\sqrt2.\) The deviation of this ray is:
1. \(30^\circ\) downward
2. \(15^\circ\) downward
3. \(30^\circ\) upward
4. \(15^\circ\) upward
1. \(30^\circ\) downward
2. \(15^\circ\) downward
3. \(30^\circ\) upward
4. \(15^\circ\) upward
Subtopic: Prisms |
69%
Level 2: 60%+
Hints
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