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Q. No.A ray of light is incident on a mirror which is lying on the \(x-y\) 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. \(-3\hat i+4\hat j-2\hat k\)
Subtopic: Â Reflection at Plane Surface |
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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 \(20\) m and \(2\) cm respectively. Consider the following statements about the telescope:
The correct statements are:
| (a) | the distance between the objective and the eyepiece is \(20.02\) 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. |
| 1. | (a), (b), and (c) |
| 2. | (b), (c), and (d) |
| 3. | (c), (d), and (a) |
| 4. | (a), (b), and (d) |
Subtopic: Â Telescope |
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From NCERT
NEET - 2022
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A beam of light is incident vertically on a glass slab of thickness \(1\) 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. | \(10^{-10}\) s | 2. | \(5\times 10^{-10}\) s |
| 3. | \(10^{-11}\) s | 4. | \(5\times 10^{-11}\) s |
Subtopic: Â Refraction at Plane Surface |
 53%
From NCERT
NEET - 2022
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A concave lens of focal length \(-25\) cm is sandwiched between two convex lenses, each of focal length, \(40\) cm. The power in dioptre of the combined lens would be:
| 1. | \(55\) | 2. | \(9\) |
| 3. | \(1\) | 4. | \(0.01\) |
Subtopic: Â Lenses |
 67%
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. | \(90^\circ\) |
Subtopic: Â Refraction at Plane Surface |
 60%
From NCERT
NEET - 2022
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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 |
Subtopic: Â Lenses |
 71%
From NCERT
NEET - 2022
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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: Â Prisms |
 68%
From NCERT
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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: Â Total Internal Reflection |
 89%
From NCERT
NEET - 2013
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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. \(50^\circ\)
1. \(45^\circ\)
2. \(30^\circ\)
3. \(55^\circ\)
4. \(50^\circ\)
Subtopic: Â Reflection at Plane Surface |
 55%
From NCERT
NEET - 2013
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A ray of light \((1)\) gets reflected partially at the front surface of a thin film of thickness \(t,\) and refractive index \(\mu.\) The reflected ray from the front surface is \(2\) while that emerging due to reflection from the rear surface is \(3.\) Assume that ray \(1\) is incident normally. The optical path difference between rays \(2\) and \(3\) is:
1. \((\mu-1)t\)
2. \(2(\mu-1)t\)
3. \(\mu t\)
4. \(2\mu t\)
1. \((\mu-1)t\)
2. \(2(\mu-1)t\)
3. \(\mu t\)
4. \(2\mu t\)
Subtopic: Â Refraction at Plane Surface |
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