# Choose the correct mirror image of the figure:      1. 2. 3. 4.

Subtopic:  Reflection at Plane Surface |
77%
From NCERT
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If there had been one eye of a man, then:

 1 image of the object would have been inverted 2 visible region would have decreased 3 image would have not been seen in three dimensional 4 Both (2) and (3)

Subtopic:  Human Eye |
55%
From NCERT
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The near point of a person is 50 cm and the far point is 1.5 m. The spectacles required for reading purposes and for seeing distant objects are respectively:

1. + 2D, $$-\frac{2}{3}~D$$
2. $$+\frac{2}{3}~D$$, - 2 D

3. - 2 D, $$+\frac{2}{3}~D$$

4. $$-\frac{2}{3}~D$$, + 2 D

Subtopic:  Human Eye |
71%
From NCERT
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An astronomical refracting telescope will have large angular magnification and high angular resolution when it has an objective lens of:

 1 Small focal length and large diameter 2 Large focal length and small diameter 3 Large focal length and large diameter 4 Small focal length and small diameter

Subtopic:  Telescope |
62%
From NCERT
NEET - 2018
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An air bubble in a glass slab with refractive index 1.5 (near-normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is:

 1 8 2 10 3 12 4 16
Subtopic:  Refraction at Plane Surface |
74%
From NCERT
NEET - 2016
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If the focal length of the objective lens is increased, then magnifying power of:

 1 microscope will increase but that of telescope decrease 2 microscope and telescope both will increase 3 microscope and telescope both will decrease 4 microscope will decrease but that of the telescope will increase
Subtopic:  Simple & Compound Microscope |
67%
From NCERT
AIPMT - 2014
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A ray of light is incident at an angle of incidence, i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is $\mu$, the angle of incidence i is nearly equal to:

 1 $$\mu \mathrm{A}$$ 2 $$\frac{\mu A}{2}$$ 3 $$A / \mu$$ 4 $$A / 2 \mu$$
Subtopic:  Prisms |
69%
From NCERT
AIPMT - 2012
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A concave mirror of the focal length ${f}_{1}$ is placed at a distance of d from a convex lens of focal length ${f}_{2}$. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returns to infinity. The distance d must be equal to:

1. ${f}_{1}+{f}_{2}$

2. $-{f}_{1}+{f}_{2}$

3. $2{f}_{1}+{f}_{2}$

4. $-2{f}_{1}+{f}_{2}$

Subtopic:  Refraction at Curved Surface |
From NCERT
AIPMT - 2012
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The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal lengths of lenses are:

1. 10 cm, 10 cm

2. 15 cm, 5 cm

3. 18 cm, 2 cm

4. 11 cm, 9 cm

Subtopic:  Telescope |
85%
From NCERT
AIPMT - 2012
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In an astronomical telescope, the focal length of the objective lens is 100 cm and of the eyepiece is 2 cm. The magnifying power of the telescope for the normal eye is:

1. 50

2. 10

3. 100

4. $\frac{1}{50}$

Subtopic:  Telescope |
89%
From NCERT
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