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:  Reflection at Spherical Surface |
90%
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:  Reflection at Spherical Surface |
86%
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:  Reflection at Spherical Surface |
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:  Reflection at Spherical Surface |
69%
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:  Reflection at Spherical Surface |
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:  Reflection at Spherical Surface |
60%
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:  Reflection at Spherical Surface |
61%
From NCERT
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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:  Reflection at Spherical Surface |
57%
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:  Reflection at Spherical Surface |
59%
From NCERT
NEET - 2012
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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 centre of curvature of the mirror is: [f $\to$ focal length of the mirror]
1.  Zero
2.  $\frac{\mathrm{f}}{2}$
3.  f
4.  2f

Subtopic:  Reflection at Spherical Surface |
From NCERT
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