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 |
 61%
From NCERT
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A plane mirror is placed horizontally inside water (μ=4/3). A ray falls normally on it. Then the mirror is rotated through an angle \(\theta\). The minimum value of \(\theta\) for which the ray does not come out of the water surface is:
           

1. π4

2. sin-134

3. 12sin-134

4. 2sin-134

Subtopic:  Total Internal Reflection |
From NCERT
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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. 150

Subtopic:  Telescope |
 89%
From NCERT
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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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A concave mirror of the focal length f1 is placed at a distance of d from a convex lens of focal length f2. 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. f1+f2

2. -f1+f2

3. 2f1+f2

4. -2f1+f2

Subtopic:  Refraction at Curved Surface |
From NCERT
AIPMT - 2012
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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 μ, 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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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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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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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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For a light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is:

1. \(30^{\circ}\) 2. \(45^{\circ}\)
3. \(60^{\circ}\) 4. \(90^{\circ}\)
Subtopic:  Refraction at Plane Surface |
 58%
From NCERT
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