Q. No.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. |
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. |
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. | \(46^\circ~\) |
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)
Match the corresponding entries of Column-1 with Column-2. (Where \(m\) is the magnification produced by the mirror)
| Column-1 | Column-2 | ||
| A. | \(m= -2\) | I. | convex mirror |
| B. | \(m= -\frac{1}{2}\) | II. | concave mirror |
| C. | \(m= +2\) | III. | real Image |
| D. | \(m= +\frac{1}{2}\) | IV. | virtual Image |
| A | B | C | D | |
| 1. | I & III | I & IV | I & II | III & IV |
| 2. | I & IV | II & III | II & IV | II & III |
| 3. | III & IV | II & IV | II & III | I & IV |
| 4. | II & III | II & III | II & IV | I & IV |
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. |  |
Given below are two statements:
| Assertion (A): | The formula connecting u, v and f for a spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature. |
| Reason (R): | Laws of reflection are strictly valid for plane surfaces, but not for large spherical mirrors. |
| 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 double convex lens (\(\mu=1.5\)) has focal length \(10\) cm. When the lens is immersed in water \((\mu=\frac{4}{3})\) its focal length becomes \(20\) cm. |
| Reason (R): | \(\frac{1}{f}=\frac{\mu_l-\mu_m}{\mu_m}(\frac{1}{R_1}-\frac{1}{R_2})\) |
| 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. |
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) |
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