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Q. No.An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance \(x\) in front of the second wall. The required focal length of the lens will be:
| 1. | less than \(\dfrac x4\) |
| 2. | more than \(\dfrac x4\) but less than \(\dfrac x2\) |
| 3. | \(\dfrac x2\) |
| 4. | \(\dfrac x4\) |
Subtopic: Â Refraction at Curved Surface |
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A magician during a show makes a glass lens with \(n=1.47\) disappear in a trough of liquid. What is the refractive index of the liquid?
1. \( 1.47 \)
2. \( 1.33 \)
3. \(0.66 \)
4. \( 1.5\)
Subtopic: Â Refraction at Curved Surface |
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A ray of white light is incident on a spherical water drop whose centre is \(\mathrm{C}\) as shown below. When observed from the opposite side, the emergent light:
| 1. | will be white and will emerge without deviating. |
| 2. | will be internally reflected. |
| 3. | will split into different colours such that the angles of deviation will be different for all colours. |
| 4. | will split into different colours such that the angles of deviation will be the same for all colours. |
Subtopic: Â Refraction at Curved Surface |
From NCERT
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