(A) | Incident rays travelling parallel to the principal axis always pass through \(F\) after reflection. |
(B) | Incident rays passing through \(F\) always travel parallel to the principal axis after reflection. |
(C) | The image formed is always inverted. |
(D) | The image formed is always real. |
(E) | The image formed is always larger than the object. |
1. | (A) and (C) only |
2. | (C), (D) and (E) only |
3. | (B) and (D) only |
4. | (A) and (B) only |
(a) | the distance between the objective and the eyepiece is \(20.02\) m. |
(b) | the magnification of the telescope is \(-1000\). |
(c) | the image of the planet is erect and diminished. |
(d) | the aperture of the eyepiece is smaller than that of the objective. |
Statement I: | In this case, the frequency of light increases. |
Statement II: | In the above case, the refractive index of the medium increases. |
1. | Statement I is incorrect and Statement II is correct. |
2. | Both Statement I and Statement II are correct. |
3. | Both Statement I and Statement II are incorrect. |
4. | Statement I is correct and Statement II is incorrect. |
Statement I: | In total internal reflection, the angle of incidence must be greater than a certain minimum angle which depends on the media involved. |
Statement II: | Total internal reflection cannot occur when light is travelling from an optically rarer to a denser medium. |
1. | Statement I is incorrect and Statement II is correct. |
2. | Both Statement I and Statement II are correct. |
3. | Both Statement I and Statement II are incorrect. |
4. | Statement I is correct and Statement II is incorrect. |
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. |
Assertion (A): | Parallel rays of light of different colours fail to converge to a point after reflection from a spherical mirror. |
Reason (R): | The refractive index of any material depends on the frequency of light. |
1. | (A) is True but (R) is False. |
2. | (A) is False but (R) is True. |
3. | Both (A) and (R) are True and (R) is a correct explanation of (A). |
4. | Both (A) and (R) are True but (R) is not a correct explanation of (A). |
1. | \(2~\text{cm}\) | 2. | \(20~\text{cm}\) |
3. | \(115~\text{cm}\) | 4. | \(230~\text{cm}\) |
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 \(25~\text{cm}\) and hence it subtends a large angle. |
1. | (A) is True but (R) is False. |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
4. | (A) is False but (R) is True. |
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 |
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) |