A tall man, of height $$6$$ feet, wants to see his full image. The required minimum length of the mirror will be:

 1 $$12$$ feet 2 $$3$$ feet 3 $$6$$ feet 4 Any length
Subtopic:  Reflection at Plane Surface |
85%
From NCERT
AIPMT - 2000
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Choose the correct mirror image of the figure:

 1 2 3 4
Subtopic:  Reflection at Plane Surface |
77%
From NCERT
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Two plane mirrors, $$A$$ and $$B$$ are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of $$30^\circ$$ at a point just inside one end of $$A$$. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (excluding the first one) before it emerges out is:

1. $$28$$
2. $$30$$
3. $$32$$
4. $$34$$

Subtopic:  Reflection at Plane Surface |
72%
From NCERT
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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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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 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 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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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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When a ray of light falls on a given plate at an angle of incidence $$60^{\circ}$$, the reflected and refracted rays are found to be normal to each other. The refractive index of the material of the plate is:

 1 $$\frac{\sqrt{3}}{2}$$ 2 $$1.5$$ 3 $$1.732$$ 4 $$2$$
Subtopic:  Refraction at Plane Surface |
76%
From NCERT
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