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Q. No.A mobile phone lies along the principal axis of a concave mirror, as shown in the figure. Then,
1.
the magnification is not uniform due to the length of the object along the principal axis.
2.
the distortion of the image depends on the location of the phone with respect to the mirror.
3.
both (1) and (2)
4.
none of these
Subtopic: Reflection at Spherical Surface |
85%
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Select the correct option based on statements below:
| Assertion (A): | For a simple microscope, the angular size of the object equals the angular size of the image. |
| Reason (R): | Magnification is achieved as the small object can be kept much closer to the eye than 25 cm and hence it subtends a large angle. |
| 1. | (A) is True but (R) is False. |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Simple & Compound Microscope |
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Suppose that the lower half of the concave mirror’s reflecting surface in the given figure is covered with an opaque (non-reflective) material. What effect will this have on the image of an object placed in front of the mirror?
| 1. | the image will show only half of the object |
| 2. | the image will show the whole of the object |
| 3. | the intensity of the image will be low |
| 4. | both (2) and (3) |
Subtopic: Reflection at Spherical Surface |
77%
From NCERT
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A lens is placed as shown in the figure, with the \(x\)-axis along the principal axis and the origin at the optical centre. A ray of light incident on the lens at \(P~(0, y)\) undergoes a deviation \(\delta.\) A graph of \(\delta\) vs \(y\) is shown:
The focal length of the lens is nearly:
The focal length of the lens is nearly:
| 1. | \(2~\text{cm}\) | 2. | \(20~\text{cm}\) |
| 3. | \(115~\text{cm}\) | 4. | \(230~\text{cm}\) |
Subtopic: Lenses |
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Given below are two statements:
| Assertion (A): | Parallel rays of light of different colours fail to converge to a point after reflection from a spherical mirror. |
| Reason (R): | The refractive index of any material depends on the frequency of light. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is a correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not a correct explanation of (A). |
Subtopic: Reflection at Spherical Surface |
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There are certain materials developed in laboratories that have a negative refractive index (figure). A ray incident from the air (medium-\(1\)) into such a medium (medium-\(2\)) shall follow a path given by:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Refraction at Plane Surface |
52%
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Given below are two statements:
| Assertion (A): | If two converging lenses are introduced into the path of a parallel beam of light, the emerging beam cannot be diverging. |
| Reason (R): | The converging lenses have positive powers. |
| 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. | (A) is false but (R) is true. |
Subtopic: Lenses |
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Given below are two statements:
| Statement I: | In total internal reflection, the angle of incidence must be greater than a certain minimum angle which depends on the media involved. |
| Statement II: | Total internal reflection cannot occur when light is travelling from an optically rarer to a denser medium. |
| 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: Total Internal Reflection |
72%
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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 |
69%
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The diagram represents a concave mirror, where \(F\) is the principal focus and \(f\) is the focal length. The mirror is used to produce an image of an object.
Which of the following statements are correct?
(Assume the mirror is parabolic.)
Which of the following statements are correct?
(Assume the mirror is parabolic.)
| (A) | Incident rays travelling parallel to the principal axis always pass through \(F\) after reflection. |
| (B) | Incident rays passing through \(F\) always travel parallel to the principal axis after reflection. |
| (C) | The image formed is always inverted. |
| (D) | The image formed is always real. |
| (E) | The image formed is always larger than the object. |
| 1. | (A) and (C) only |
| 2. | (C), (D) and (E) only |
| 3. | (B) and (D) only |
| 4. | (A) and (B) only |
Subtopic: Reflection at Spherical Surface |
82%
From NCERT
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