# A plane mirror approaches a stationary person with acceleration of 10 ms–2. The acceleration of his image as seen by the person, will be: 1. 10 m/s2  2. 20 m/s2 3. 5 m/s2  4. can't be determined

Subtopic:  Reflection at Plane Surface |
66%
From NCERT
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A light ray is incident at an angle of  $$30^{\circ}$$ on a transparent surface separating two media. If the angle of refraction is $$60^{\circ}$$, then the critical angle is:

1. ${\mathrm{sin}}^{-1}\left(\frac{1}{\sqrt{3}}\right)$

2. ${\mathrm{sin}}^{-1}\left(\sqrt{3}\right)$

3. ${\mathrm{sin}}^{-1}\left(\frac{2}{3}\right)$

4. $$45^{\circ}$$

Subtopic:  Total Internal Reflection |
52%
From NCERT
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In the figure shown the angle made by the light ray with the normal in the medium of refractive index $\sqrt{2}$ is:

1. $$30^{\circ}$$

2. $$60^{\circ}$$

3. $$90^{\circ}$$

4. None of these

Subtopic:  Refraction at Plane Surface |
73%
From NCERT
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A fish is a little away below the surface of a lake. If the critical angle is $$49^{\circ}$$, then the fish could see things above the water surface within an angular range of $$\theta^{\circ}$$ where:
1. $$\theta = 49^{\circ}$$
2. $$\theta = 90^{\circ}$$
3. $$\theta = 98^{\circ}$$$\mathrm{}$
4. $$\theta = 24\frac{1}{2}^{\circ}$$

Subtopic:  Total Internal Reflection |
62%
From NCERT
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An object is placed at a point distance $$x$$ from the focus of a convex lens and its image is formed at $$I$$ as shown in the figure. The distances $$x$$ and $$x'$$ satisfy the relation:

1. $$\frac{x+x'}{2} = f$$
2. $$f = xx'$$
3. $$x+x' \le 2f$$
4. $$x+x' \ge 2f$$

Subtopic:  Lenses |
From NCERT
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The diameter of the eye-ball of a normal eye is about 2.5 cm. The power of the eye lens varies from:

1. 2 D to 10 D

2. 40 D to 32 D

3. 9 D to 8 D

4. 44 D to 40 D

Subtopic:  Human Eye |
From NCERT
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In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be the angle of refraction?

 1 $$90^{\circ}$$ 2 $$180^{\circ}$$ 3 $$0^{\circ}$$ 4 equal to the angle of incidence
Subtopic:  Total Internal Reflection |
74%
From NCERT
NEET - 2019
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A small coin is resting on the bottom of a beaker filled with a liquid. A ray of light from the coin travels up, to the surface of the liquid and moves along its surface (see figure).

How fast is the light traveling in the liquid?

 1 $$1.8 \times 10^8 \mathrm{~m} / \mathrm{s}$$ 2 $$2.4 \times 10^8 \mathrm{~m} / \mathrm{s}$$ 3 $$3.0 \times 10^8 \mathrm{~m} / \mathrm{s}$$ 4 $$1.2 \times 10^8 \mathrm{~m} / \mathrm{s}$$
Subtopic:  Total Internal Reflection |
63%
From NCERT
AIPMT - 2007
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Focal length of objective lens and eyepiece of an astronomical telescope are 200 cm and 10 cm respectively. The length of telescope for maximum magnification is nearly:

1. 207 cm

2. 210 cm

3. 204 cm

4. 220 cm

Subtopic:  Telescope |
From NCERT
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On an optical bench a point object is placed at the mark of 10 cm, a convex lens of focal length 15 cm at the mark of 40 cm and a concave lens of focal length 15 cm placed at the mark of 60 cm. The final image is formed at the mark of: (point object and two lenses are coaxial)

1. 30 cm

2. 80 cm

3. 90 cm

4. infinity

Subtopic:  Lenses |
52%
From NCERT
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