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Q. No.An object approaches a convergent lens from the left of the lens with a uniform speed \(5\) m/s and stops at the focus. The image
| 1. | moves away from the lens with an uniform speed \(5\) m/s. |
| 2. | moves away from the lens with an uniform acceleration. |
| 3. | moves away from the lens with a non-uniform acceleration. |
| 4. | moves towards the lens with a non-uniform acceleration. |
Subtopic: Â Lenses |
Level 3: 35%-60%
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The radius of curvature of the curved surface of a plano-convex lens is \(20~\text{cm}\). If the refractive index of the material of the lens be \(1.5\), it will:
| 1. | act as a convex lens only for the objects that lie on its curved side. |
| 2. | act as a concave lens for the objects that lie on its curved side. |
| 3. | act as a convex lens irrespective of the side on which the object lies. |
| 4. | act as a concave lens irrespective of side on which the object lies. |
Subtopic: Â Lenses |
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Level 2: 60%+
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A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in
a. a larger angle to be subtended by the object at the eye and hence viewed in greater detail.
b. the formation of a virtual erect image.
c. increase in the field of view.
d. infinite magnification at the near point.
Choose the correct option:
1. (a), (b)
2. (a), (c), (d)
3. (b), (d)
4. (c), (d)
a. a larger angle to be subtended by the object at the eye and hence viewed in greater detail.
b. the formation of a virtual erect image.
c. increase in the field of view.
d. infinite magnification at the near point.
Choose the correct option:
1. (a), (b)
2. (a), (c), (d)
3. (b), (d)
4. (c), (d)
Subtopic: Â Lenses |
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Level 2: 60%+
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