To increase the angular magnification of a simple microscope, one should increase:
1. | the focal length of the lens | 2. | the power of the lens |
3. | the aperture of the lens | 4. | the object size |
A man is looking at a small object placed at his near point. Without alternating the position of his eye or the object, he puts a simple microscope of magnifying power 5X before his eyes. The angular magnification achieved is
1. 5
2. 2.5
3. 1
4. 0.2
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When we see an object, the image formed on the retina is
(a) real
(b) virtual
(c) erect
(d) inverted
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)
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In which of the following the final image is erect?
(a) Simple microscope
(b) Compound microscope
(c) Astronomical telescope
(d) Galilean telescope
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)
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The maximum focal length of the eye-lens of a person is greater than its distance from the retina. The eye is
1. always strained in looking at an object
2. strained for objects at larger distances only
3. strained for objects at short distances only
4. unstrained for all distances
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Mark the correct options.
(a) If the far point goes ahead, the power of the divergent lens should be reduced
(b) If the near point goes ahead, the power of the convergent lens should be reduced
(c) If the far point is 1m away from the eye, divergent lens should be used
(d) If the near point is 1m away from the eye, divergent lens should be used
1. (a) and (b)
2. (b) and (c)
3. (a) and (c)
4. (c) and (d)
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The focal length of the objective of a compound microscope is f0 and its distance from the eyepiece is L. The object is placed at a distance u from the objective. For proper working of the instrument,
(a) L < u
(b) L > u
(c) f0 < L < 2f0
(d) L > 2f0
Choose the correct option:
1. (a) and (b)
2. (b) and (d)
3. (b) and (c)
4. (c) and (d)
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The angular dispersion produced by a prism:
1. | increases if the average refractive index increases |
2. | increases if the average refractive index decreases |
3. | remains constant whether the average refractive index increases or decreases |
4. | has no relation with the average refractive index |
If a glass prism is dipped in water, its dispersive power
1. increases
2. decreases
3. does not change
4. may increase or decrease depending on whether the angle of the prism is less than or greater than 60°
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A prism can produce a minimum deviation \(\delta\) in a light beam. If three such prisms are combined, the minimum deviation that can be produced in this beam is
1. 0
2. \(\delta\)
3. 2\(\delta\)
4. 3\(\delta\)
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