The angle of a prism is 'A'. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index μ, of the prism, is :
1. 2sin A
2. 2cosA
3. cos A
4. tan A
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2. 1.67 cm
3. 1.5 cm
4. 5 cm
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When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. The liquid must have a refractive index
1. equal to that of glass
2. less than one
3. greater than that of glass
4. less than that of glass
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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 , the angle of incidence i is nearly equal to:
| 1. | \(\mu \mathrm{A} \) | 2. | \(\frac{\mu A}{2} \) |
| 3. | \(A / \mu \) | 4. | \(A / 2 \mu\) |
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A concave mirror of the focal length is placed at a distance of d from a convex lens of focal length . 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.
2.
3.
4.
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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
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1. Virtual, upright, height = 0.5 cm
2. Real, inverted, height =4 cm
3. Real, inverted, height = 1 cm
4. Virtual, upright, height = 1 cm
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1. Difference between apparent and real depth of the pond
2. Mirage on hot summer days
3. Brilliance of diamond
4. Working of optical fiber
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A ray of light traveling in a transparent medium of refractive index falls on a surface separating the medium from the air at an angle of incidence of 45 °. For which of the following value of the ray can undergo total internal reflection?
1.
2.
3.
4.
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