Q. No.The image formed by a concave mirror:
| 1. | is always real |
| 2. | is always virtual |
| 3. | is certainly real if the object is virtual |
| 4. | is certainly virtual if the object is real |
Subtopic: Â Reflection at Spherical Surface |
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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)
Choose the correct option:
Which of the following statements are correct?
(assume the mirror is parabolic)
| (A) | Incident rays traveling 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. |
Choose the correct option:
| 1. | (A) and (C) only |
| 2. | (C), (D) and (E) only |
| 3. | (B) and (D) only |
| 4. | (A) and (B) only |
Subtopic: Â Reflection at Spherical Surface |
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Level 1: 80%+
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The direction of ray of light incident on a concave mirror is shown by \(\mathrm{PQ}\) while directions in which the ray would travel after reflection is shown by four rays marked \(1,2,3\) and \(4\). Which of the four rays correctly shows the direction of reflected ray?
| 1. | \(1\) | 2. | \(2\) |
| 3. | \(3\) | 4. | \(4\) |
Subtopic: Â Reflection at Spherical Surface |
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Level 2: 60%+
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A car is moving with at a constant speed of \(60~\text{km/h}\) on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of \(100~\text{m}\) and is approaching with a speed of \(5~\text{km/h}\). In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every \(2~\text{s}\) till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement (s) is/are correct?
| 1. | The speed of the car in the rear is \(65~\text{km/h}\). |
| 2. | In the side mirror the car in the rear would appear to approach with a speed of \(5~\text{km/h}\) to the driver of the leading car. |
| 3. | In the rear view mirror the speed of the approaching car would appear to decrease as the distance between the cars decreases. |
| 4. | In the side mirror, the speed of the approaching car would appear to increase as the distance between the cars decreases. |
Subtopic: Â Reflection at Spherical Surface |
Level 3: 35%-60%
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An object is placed on the principal axis of a concave mirror at a distance of \(1.5f\) (\(f\) is the focal length). The image will be at:
| 1. | \(-3f\) | 2. | \(1.5f\) |
| 3. | \(-1.5f\) | 4. | \(3f\) |
Subtopic: Â Reflection at Spherical Surface |
 70%
Level 2: 60%+
NEET - 2020
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An object is at the centre of the curvature of a concave mirror having a radius of curvature \(R.\) If the object is displaced by \(\dfrac R2\) away from the mirror, the displacement of the image will be:
| 1. | \(\dfrac{5R}{8}\) towards the mirror |
| 2. | \(\dfrac{5R}{8}\) away from the mirror |
| 3. | \(\dfrac R4\) towards the mirror |
| 4. | \(\dfrac R4\) away from mirror |
Subtopic: Â Reflection at Spherical Surface |
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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: Â Reflection at Spherical Surface |
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A small object is placed on the principal axis of a convex lens and it forms a real image with a (transverse) magnification of \(2.\) If the object were to move perpendicular to the principal axis with a speed \(u,\) the speed of the image will be:
| 1. | \(u\) | 2. | \(u/2\) |
| 3. | \(2u\) | 4. | \(4u\) |
Subtopic: Â Reflection at Spherical Surface |
Level 3: 35%-60%
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A \(4.5~\text{cm}\) needle is placed \(12~\text{cm}\) away from a convex mirror of focal length \(15~\text{cm}.\) What is the magnification?
1. \(0.5\)
2. \(0.56\)
3. \(0.45\)
4. \(0.15\)
Subtopic: Â Reflection at Spherical Surface |
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The graph that shows the correct variation of \(\dfrac{1}{v}\) with \(\dfrac{1}{u}\) for a concave mirror, where \(u\) is the object distance and \(v\) is the image distance, is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â Reflection at Spherical Surface |
 53%
Level 3: 35%-60%
NEET - 2024
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