# 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. 37º 2. 45º 3. 90º 4. 0º

Subtopic:  Reflection at Plane Surface |
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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. $\left(n-1\right)f$

2. $\left\{\frac{\left(n-1\right)}{n}\right\}f$

3. $\left\{\frac{\left(n+1\right)}{n}\right\}f$

4.

Subtopic:  Reflection at Spherical Surface |
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A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. What is the magnification?

1. 0.5

2. 0.56

3. 0.45

4. 0.15

Subtopic:  Reflection at Spherical Surface |
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A man with hypermetropia cannot see objects closer than a distance of 40 cm from the eye. The power of the lens required so that he can see objects at 25 cm from the eye is:

1. +4.5 D

2. +4.0 D

3. 1.5 D

4. +3.0 D

Subtopic:  Human Eye |
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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. 30o

2. 45o

3. 60o

4. 90o

Subtopic:  Refraction at Plane Surface |
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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 |
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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 $\mathrm{\theta }$. The minimum value of $\mathrm{\theta }$ 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 |
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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 |
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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 |
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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 |
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