# Light of wavelength 5000 Å falls on a plane reflecting surface. For what angle of incidence is the reflected ray normal to the incident ray? 1. $$37^{\circ}$$ 2. $$45^{\circ}$$ 3. $$90^{\circ}$$ 4. $$0^{\circ}$$

Subtopic:  Reflection at Plane Surface |
66%
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A concave mirror of focal length $$f$$ produces an image $$n$$ times the size of the object. If the image is real, then the distance of the object from the mirror is:
1. $$(n-1)f$$
2. $$\frac{(n-1)}{n}f$$
3. $$\frac{(n+1)}{n}f$$
4. $$(n+1)f$$

Subtopic:  Reflection at Spherical Surface |
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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 man with hypermetropia cannot see objects closer than a distance of $$40~\text{cm}$$ from the eye. The power of the lens required so that he can see objects at $$25~\text{cm}$$ from the eye is:
1. $$+4.5~\text{D}$$
2. $$+4.0~\text{D}$$
3. $$+1.5~\text{D}$$
4. $$+3.0~\text{D}$$

Subtopic:  Human Eye |
74%
From NCERT
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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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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 $\left(\mathrm{\mu }=4/3\right)$. 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. $\frac{\mathrm{\pi }}{4}$

2. ${\mathrm{sin}}^{-1}\left(\frac{3}{4}\right)$

3. $\frac{1}{2}{\mathrm{sin}}^{-1}\left(\frac{3}{4}\right)$

4. 2${\mathrm{sin}}^{-1}\left(\frac{3}{4}\right)$

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. $\frac{1}{50}$

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 ${f}_{1}$ 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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