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Q. No.A plane triangular object \((ABC)\) is placed in front of a mirror, as shown.
Which, of the following diagrams, shows the correct orientation of the image \((A'B'C')\)?
Which, of the following diagrams, shows the correct orientation of the image \((A'B'C')\)?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Reflection at Plane Surface |
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Given below are two statements:
| Assertion (A): | Spherical aberration is absent in plane mirrors. |
| Reason (R): | Plane mirrors form exact life-size virtual images; and since these aren't spheres, they do not suffer from this type of aberration. |
| 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: Reflection at Plane Surface |
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A laser beam is an incident on a flat/plane mirror at some angle and results in a reflected beam. The mirror is now rotated by an angle \(\delta\) while the direction of incident laser beam is kept the same. The angle between the new reflected beam and the reflected beam before the mirror was rotated is
1. 2\(\delta\)
2. 0
3. \(\delta\)
4. \(\delta\)/2
1. 2\(\delta\)
2. 0
3. \(\delta\)
4. \(\delta\)/2
Subtopic: Reflection at Plane Surface |
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Given below are two statements:
| Statement I: | The speed of light does not change after it is reflected from a mirror. |
| Statement II: | The speed of light depends on the medium in which light is propagating. |
| 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: Reflection at Plane Surface |
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A plane mirror rotating at an angular velocity of \(5~\text{rad/s}\) reflects a light beam. What will be the angular velocity of the light beam?
1. \(5~\text{rad/s}\)
2. \(10~\text{rad/s}\)
3. \(15~\text{rad/s}\)
4. \(20~\text{rad/s}\)
1. \(5~\text{rad/s}\)
2. \(10~\text{rad/s}\)
3. \(15~\text{rad/s}\)
4. \(20~\text{rad/s}\)
Subtopic: Reflection at Plane Surface |
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A point source of light \(S\), placed at a distance \(60\) cm in front of the centre of a plane mirror of width \(50\) cm, hangs vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance \(1.2\) m from it (see in the figure). The distance between the extreme points where he can see the image of the light source in the mirror is:
1. \(150\) cm
2. \(300\) cm
3. \(450\) cm
4. \(600\) cm
Subtopic: Reflection at Plane Surface |
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An object placed in front of a concave mirror of a focal length \(15~\text{cm}\) produces a virtual image which is twice the size of the object. The position of the object is:
1. \(\text{-}5.5~\text{cm}\)
2. \(\text{-}6.5~\text{cm}\)
3. \(\text{-}7.5~\text{cm}\)
4. \(8.5~\text{cm}\)
1. \(\text{-}5.5~\text{cm}\)
2. \(\text{-}6.5~\text{cm}\)
3. \(\text{-}7.5~\text{cm}\)
4. \(8.5~\text{cm}\)
Subtopic: Reflection at Spherical Surface |
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In a convex mirror having a radius of curvature \(30~\text{cm}\) the height of the image is half the object height. What will be the object (in \(\text{cm}\)) distance?
1. \(15~\text{cm}\)
2. \(25~\text{cm}\)
3. \(35~\text{cm}\)
4. \(30~\text{cm}\)
1. \(15~\text{cm}\)
2. \(25~\text{cm}\)
3. \(35~\text{cm}\)
4. \(30~\text{cm}\)
Subtopic: Reflection at Spherical Surface |
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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 |
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A convex mirror of focal length \(20~\text{cm}\) forms an image that is a quarter of the object's size. The distance of the object from the mirror is:
1. \(50~\text{cm}\)
2. \(-60~\text{cm}\)
3. \(-40~\text{cm}\)
4. \(-70~\text{cm}\)
Subtopic: Reflection at Spherical Surface |
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