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Q. No.Given below are two statements:
Assertion (A):
There is no dispersion of light refracted through a rectangular glass slab.
Reason (R):
Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.
1.
Both (A) and (R) are True and (R) is the correct explanation of (A).
2.
Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.
(A) is True but (R) is False.
4.
Both (A) and (R) are False.
Subtopic: Prisms |
80%
From NCERT
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Given below are two statements:
| Assertion (A): | If objective and eye lenses of a microscope are interchanged, then it can work as telescope. |
| Reason (R): | The objective lens of telescope has small focal length. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Telescope |
From NCERT
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A parallel beam of light is incident onto a converging lens \((L_1)\) of focal length \(20~\text{cm}.\) A second identical lens \((L_2)\) is to be placed behind \(L_1,\) coaxially, so that the emerging beam is parallel. The distance between \(L_1\) and \(L_2\) should be:
| 1. | \(10\) cm | 2. | \(20\) cm |
| 3. | \(40\) cm | 4. | zero |
Subtopic: Lenses |
77%
From NCERT
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The magnifying power of an astronomical telescope is \(8,\) and the distance between the two lenses is \(54\) cm. The focal lengths of the eye lens and the objective lens are, respectively:
| 1. | \(6\) cm and \(48\) cm |
| 2. | \(48\) cm and \(6\) cm |
| 3. | \(8\) cm and \(64\) cm |
| 4. | \(64\) cm and \(8\) cm |
Subtopic: Telescope |
78%
From NCERT
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If the angle of the prism is \(60^\circ\) and the angle of minimum deviation is \(40^\circ,\) the angle of refraction will be:
1. \(30^\circ\)
2. \(60^\circ\)
3. \(100^\circ\)
4. \(120^\circ\)
1. \(30^\circ\)
2. \(60^\circ\)
3. \(100^\circ\)
4. \(120^\circ\)
Subtopic: Prisms |
73%
From NCERT
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An air bubble in a glass slab \((\mu=1.5) \) is \(5\) cm deep when viewed from one face and \(2\) cm deep when viewed from the opposite face. The thickness of the slab is:
1. \(10\) cm
2. \(7.5\) cm
3. \(10.5\) cm
4. \(7\) cm
1. \(10\) cm
2. \(7.5\) cm
3. \(10.5\) cm
4. \(7\) cm
Subtopic: Refraction at Plane Surface |
81%
From NCERT
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As light traverses through an optical medium, it is observed that its wavelength decreases.
| Statement I: | In this case, the frequency of light increases. |
| Statement II: | In the above case, the refractive index of the medium increases. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Refraction at Plane Surface |
65%
From NCERT
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The graph between \(\dfrac1u\) and \(\dfrac1v\) for a thin convex lens in order to determine its focal length is plotted as shown in the figure. The refractive index of the lens is \(1.5\) and both surfaces have the same radius of curvature \(R.\) The value of \(R\) will be: (where \(u\) = object distance, \(v\) = image distance)
1. \(10~\text{cm}\)
2. \(20~\text{cm}\)
3. \(30~\text{cm}\)
4. \(40~\text{cm}\)
1. \(10~\text{cm}\)
2. \(20~\text{cm}\)
3. \(30~\text{cm}\)
4. \(40~\text{cm}\)
Subtopic: Lens Makers' Formula |
67%
From NCERT
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The power of a lens (biconvex) is \(1.25~\text{m}^{-1}\) in a particular medium. The refractive index of the lens is \(1.5\) and the radii of curvature are \(20\) cm and \(40\) cm respectively. The refractive index of the surrounding medium is:
| 1. | \(1\) | 2. | \(\dfrac 97\) |
| 3. | \(\dfrac 3 2\) | 4. | \(\dfrac 4 3\) |
Subtopic: Lens Makers' Formula |
55%
From NCERT
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An object is placed \(30~\text{cm}\) in front of a convex spherical mirror with a radius of curvature of \(40~\text{cm}.\) The position of the image formed is:
| 1. | \(60~\text{cm}\) | 2. | \(-60~\text{cm}\) |
| 3. | \(12~\text{cm}\) | 4. | \(-12~\text{cm}\) |
Subtopic: Reflection at Spherical Surface |
65%
From NCERT
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