- 1(current)
Q. No.An object is placed \(20~\text{cm}\) in front of a concave mirror of a radius of curvature \(10~\text{cm}.\) The position of the image from the pole of the mirror is:
1. \(7.67~\text{cm}\)
2. \(6.67~\text{cm}\)
3. \(8.67~\text{cm}\)
4. \(9.67~\text{cm}\)
Subtopic: Â Reflection at Spherical Surface |
 91%
From NCERT
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Match the corresponding entries of Column 1 with Column 2.
(Where \(m\) is the magnification produced by the mirror)
Codes:
(Where \(m\) is the magnification produced by the mirror)
| Column 1 | Column 2 | ||
| A. | \(m= -2\) | I. | convex mirror |
| B. | \(m= -\frac{1}{2}\) | II. | concave mirror |
| C. | \(m= +2\) | III. | real Image |
| D. | \(m= +\frac{1}{2}\) | IV. | virtual Image |
Codes:
| A | B | C | D | |
| 1. | I & III | I & IV | I & II | III & IV |
| 2. | I & IV | II & III | II & IV | II & III |
| 3. | III & IV | II & IV | II & III | I & IV |
| 4. | II & III | II & III | II & IV | I & IV |
Subtopic: Â Reflection at Spherical Surface |
 77%
From NCERT
NEET - 2016
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When a concave mirror of focal length \(f\) is immersed in water, its focal length becomes \(f',\) then:
| 1. | \(f' = f\) |
| 2. | \(f'<f\) |
| 3. | \(f'>f\) |
| 4. | The information is insufficient to predict |
Subtopic: Â Reflection at Spherical Surface |
 70%
From NCERT
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A concave mirror gives an image three times as large as the object placed at a distance of \(20~\text{cm}\) from it. For the image to be real, the focal length should be:
| 1. | \(10~\text{cm}\) | 2. | \(15~\text{cm}\) |
| 3. | \(20~\text{cm}\) | 4. | \(30~\text{cm}\) |
Subtopic: Â Reflection at Spherical Surface |
 62%
From NCERT
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A thin rod of length \(\dfrac{f}{3}\) lies along the axis of a concave mirror of focal length \(f.\) One end of its magnified, real image touches an end of the rod. The length of the image is:
| 1. | \(f\) | 2. | \(\dfrac{f}{2}\) |
| 3. | \(2f\) | 4. | \(\dfrac{f}{4}\) |
Subtopic: Â Reflection at Spherical Surface |
 58%
From NCERT
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The distance between the object and its real image formed by a concave mirror is minimum when the distance of the object from the center of curvature of the mirror is: (where\(f\) is the focal length of the mirror)
1. zero
2. \(\dfrac{f}{2}\)
3. \(f\)
4. \(2f\)
Subtopic: Â Reflection at Spherical Surface |
 53%
From NCERT
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- 1(current)
Q. No.
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