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Q. No.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
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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 |
69%
Level 2: 60%+
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 |
59%
Level 3: 35%-60%
NEET - 2022
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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%
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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 \(20\text{m}\) 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
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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 |
73%
Level 2: 60%+
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: Prisms |
69%
Level 2: 60%+
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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. | \(2\mu t\) |
Subtopic: Refraction at Plane Surface |
Level 4: Below 35%
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A point object \((A)\) is placed on the principal axis of a convex lens (focal length = \(30~\text{cm}\)) at a distance of \(45~\text{cm}\) from it. The image is formed at position \(B.\) If the object \(A\) is moved up by \(1~\text{cm}\) then the image moves:
1. down by \(1~\text{cm}\)
2. down by \(2~\text{cm}\)
3. up by \(1~\text{cm}\)
4. up by \(2~\text{cm}\)
1. down by \(1~\text{cm}\)
2. down by \(2~\text{cm}\)
3. up by \(1~\text{cm}\)
4. up by \(2~\text{cm}\)
Subtopic: Lenses |
65%
Level 2: 60%+
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An empty cylindrical beaker whose height is equal to its diameter is kept on a table. An observer's eye\((E)\) looking towards \(S\) (line of sight: \(ES\)) can see the point \(Q\) on the lower right. The angle of view, \(\theta,\) is the angle the line of sight \(ES,\) makes with the vertical \(RS\)-extended. A transparent liquid is now slowly poured into the beaker. As the liquid level rises in the beaker, the line of sight has to be continually adjusted (by increasing angle \(\theta\)) in order to keep \(Q\) visible. When the liquid fills the beaker to the brim, \(Q\) can no more be seen by adjusting the line of sight \(ES. \) The minimum refractive index of the liquid should be:
| 1. | \(\dfrac32\) | 2. | \(2\) |
| 3. | \(\sqrt{\dfrac32} \) | 4. | \(\sqrt2\) |
Subtopic: Total Internal Reflection |
Level 3: 35%-60%
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