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Q. No.In the figure, a ray of light is perpendicular to face \(\mathrm {AB}\) of a glass prism \((\mu=3/2)\). If prism is immersed in water \((\mu=4/3),\) what will be the maximum value of \(\theta\) so that ray suffers total internal reflection at face \(\mathrm{AC}\)?
(Take \(\text{sin}^{-1}(8/9)=63^\circ\))
1. \(15^\circ\)
2. \(27^\circ\)
3. \(37^\circ\)
4. \(45^\circ\)
Subtopic: Total Internal Reflection |
76%
From NCERT
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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 |
74%
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: Refraction at Plane Surface |
62%
From NCERT
NEET - 2022
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Two transparent media \({A}\) and \({B}\) are separated by a plane boundary. The speeds of light in those media are \(1.5\times 10^{8} \) m/s and \(2.0\times 10^{8} \) m/s, respectively. The critical angle for a ray of light for these two media is:
| 1. | \(\text{tan}^{-1}(0.750)\) | 2. | \(\text{sin}^{-1}(0.500)\) |
| 3. | \(\text{sin}^{-1}(0.750)\) | 4. | \(\text{tan}^{-1}(0.500)\) |
Subtopic: Total Internal Reflection |
80%
From NCERT
NEET - 2022
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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 |
68%
From NCERT
NEET - 2022
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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 |
58%
From NCERT
NEET - 2022
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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 |
79%
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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