A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle , the spot of the light is found to move through a distance y on the scale. The angle is given by:-
1.
2.
3.
4.
Two identical glass ( = 3/2) equiconvex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water ( = 4/3). The focal length of the combination is :
1. f/3
2. f
3.
4.
| 1. | \(8\) | 2. | \(10\) |
| 3. | \(12\) | 4. | \(16\) |
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A person can see clearly objects only when they lie between \(50~\text{cm}\) and \(400~\text{cm}\) from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be
| 1. | \(\text{convex, +2.25 diopter}\) | 2. | \(\text{concave, -0.25 diopter}\) |
| 3. | \(\text{concave, -0.2 diopter}\) | 4. | \(\text{convex, +0.5 diopter}\) |
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2. 0.0 cm
3. 54.0 cm
4. 37.3 cm
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a and c; B 
a and d; C 
a and b; D 
c and d
a and d; B 
b and c; C 
b and d; D 
b and c
c and d; B 
b and d; C 
b and c; D 
a and d
b and c; B 
b and c; C 
b and d; D 
a and d
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2. -25 cm
3. -50 cm
4. 50 cm
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2. 180° - 2A
3. 90° - A
4. 180° + 2A
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If the focal length of the objective lens is increased, then magnifying power of:
| 1. | microscope will increase but that of telescope decrease |
| 2. | microscope and telescope both will increase |
| 3. | microscope and telescope both will decrease |
| 4. | microscope will decrease but that of the telescope will increase |
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