An object is placed 20 cm in front of a concave mirror of a radius of curvature 10 cm. The position of the image from the pole of the mirror is:

1. 7.67 cm

2. 6.67 cm

3. 8.67 cm

4. 9.67 cm

Subtopic: Â Reflection at Spherical Surface |
Â 91%
From NCERT
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An object is at a distance of 30 cm in front of a concave mirror of focal length 10 cm. The image of the object will be:

 1 smaller in size. 2 inverted. 3 between the focus and centre of curvature. 4 All of the above.

Subtopic: Â Reflection at Spherical Surface |
Â 86%
From NCERT
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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.)

 (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: Â Reflection at Spherical Surface |
Â 83%
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)

 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
 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 |
Â 75%
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 4 The information is insufficient to predict

Subtopic: Â Reflection at Spherical Surface |
Â 70%
From NCERT
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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 |
Â 69%
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A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be:

 1 10 cm 2 15 cm 3 20 cm 4 30 cm
Subtopic: Â Reflection at Spherical Surface |
Â 61%
From NCERT
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A convex mirror of focal length $$f$$ forms an image which is $$\frac{1}{n}$$ times the length of the object. The distance of the object from the mirror is:
1. $$(n-1)f$$
2. $$\left( \frac{n-1}{n} \right)f$$
3. $$\left( \frac{n+1}{n} \right)f$$
4. $$(n+1)f$$

Subtopic: Â Reflection at Spherical Surface |
Â 62%
From NCERT
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A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is:

 1 10 cm 2 15 cm 3 2.5 cm 4 5 cm
Subtopic: Â Reflection at Spherical Surface |
Â 60%
From NCERT
NEET - 2012
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A thin rod of length $$\frac{f}{3}$$ 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. $$\frac{f}{2}$$

3. $$2f$$

4. $$\frac{f}{4}$$

Subtopic: Â Reflection at Spherical Surface |
Â 58%
From NCERT
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