- 1(current)
Q. No.
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A lens is placed as shown in the figure, with the \(x\)-axis along the principal axis and the origin at the optical centre. A ray of light incident on the lens at \(P~(0, y)\) undergoes a deviation \(\delta.\) A graph of \(\delta\) vs \(y\) is shown:
The focal length of the lens is nearly:
1. \(2~\text{cm}\)
2. \(20~\text{cm}\)
3. \(115~\text{cm}\)
4. \(230~\text{cm}\)
The focal length of the lens is nearly:
1. \(2~\text{cm}\)
2. \(20~\text{cm}\)
3. \(115~\text{cm}\)
4. \(230~\text{cm}\)
Subtopic: Â Lenses |
Level 3: 35%-60%
Hints
Given below are two statements:
| Assertion (A): | If two converging lenses are introduced into the path of a parallel beam of light, the emerging beam cannot be diverging. |
| Reason (R): | The converging lenses have positive powers. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Â Lenses |
Level 4: Below 35%
Hints
- 1(current)
Q. No.
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