Q. No.There are certain materials developed in laboratories that have a negative refractive index (figure). A ray incident from the air (medium-\(1\)) into such a medium (medium-\(2\)) shall follow a path given by:
1.
2.
3.
4.
Which of the following phenomenon of light forms a rainbow?
1. reflection of light
2. refraction
3. total internal reflection
4. both (2) and (3)
Suppose that the lower half of the concave mirror’s reflecting surface in the given figure is covered with an opaque (non-reflective) material. What effect will this have on the image of an object placed in front of the mirror?
| 1. | the image will show only half of the object |
| 2. | the image will show the whole of the object |
| 3. | the intensity of the image will be low |
| 4. | both (2) and (3) |
A mobile phone lies along the principal axis of a concave mirror, as shown in the figure. Then,
| 1. | the magnification is not uniform due to the length of the object along the principal axis. |
| 2. | the distortion of the image depends on the location of the phone with respect to the mirror. |
| 3. | both (1) and (2) |
| 4. | none of these |
Select the correct option based on statements below:
| Assertion (A): | For a simple microscope, the angular size of the object equals the angular size of the image. |
| Reason (R): | Magnification is achieved as the small object can be kept much closer to the eye than 25 cm and hence it subtends a large angle. |
| 1. | (A) is True but (R) is False. |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is False but (R) is True. |
A graph is plotted between the angle of deviation \(\delta\) in a triangular prism and the angle of incidence as shown in the figure. Refracting angle of the prism is:
| 1. | \(28^\circ~\) | 2. | \(48^\circ~\) |
| 3. | \(36^\circ~\) | 4. | \(46^\circ~\) |
An object is at a distance of \(30~\text{cm}\) in front of a concave mirror of focal length \(10~\text{cm}\). The image of the object will be:
| 1. | smaller in size. |
| 2. | inverted. |
| 3. | between focus and centre of curvature. |
| 4. | all of these. |
Given below are two statements:
| Assertion (A): | When white light is incident on a prism it will disperse. |
| Reason (R): | The refractive index of a medium depends on the wavelength of light. |
| 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. | Both (A) and (R) are false. |
Given below are two statements:
| Assertion (A): | A beam of white light passing through a thin hollow prism does not give spectrum. |
| Reason (R): | The speed of light inside and outside the prism is same. |
| 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. | Both (A) and (R) are false. |
The focal length of the lens is nearly:
| 1. | \(2~\text{cm}\) | 2. | \(20~\text{cm}\) |
| 3. | \(115~\text{cm}\) | 4. | \(230~\text{cm}\) |
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