Q. No.The resolving power of an electron microscope is \(R,\) when the accelerating potential is \(V.\) If the accelerating potential is increased by \(3V,\) then it's new resolving power is:
1. \(3R\)
2. \(2R\)
3. \(4R\)
4. \(R\)
1. \(3R\)
2. \(2R\)
3. \(4R\)
4. \(R\)
In young's experiment, the wavelength of red light is cm and that of blue light cm. The value of n for which (n+1)th blue bright band coincides with the nth red band is:
1. 4
2. 3
3. 2
4. 1
In Young's double-slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes:
| 1. | half | 2. | four times |
| 3. | one-fourth | 4. | double |
The Brewster's angle for an interface should be:
1. \(30^{\circ}<i_b<45^{\circ}\)
2. \(45^{\circ}<i_b<90^{\circ}\)
3. \(i_b=90^{\circ}\)
4. \(0^{\circ}<i_b<30^{\circ}\)
Given below are two statements:
| Statement I: | On increasing the phase difference from \(\frac{\pi}{3} \) to \(\frac{\pi}{2}\) in YDSE, the intensity decreases by \(\frac{1}{3}\)rd. |
| Statement II: | I \(=4 \mathrm{I}_0 \quad \cos ^2 \frac{\theta}{2} \) with usual symbol meanings. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
In the following question, a statement of assertion (A) is followed by a statement of the reason (R)
A : If the background of two macroscopic objects is blue, then they are resolved well by microscope.
R : Resolving power is inversely proportional to the wavelength of light used.
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
3. If Assertion is a true statement but Reason is false, then mark (3).
4. If both Assertion and Reason are false statements, then mark (4).
Given below are two statements:
| Assertion (A): | Nicol prism is used to produce and analyze plane polarised light. |
| Reason (R): | Nicol prism reduces the intensity of the light to zero. |
| 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:
| Statement I: | Light of different colours travel at different speeds in a vacuum |
| Statement II: | Speed of light depends on the mechanical properties of the medium. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
Given below are two statements:
| Statement I: | When a thin transparent sheet is placed in front of one of the slits in YDSE, the fringe of zero-order shifts to some other position |
| Statement II: | On placing this transparent sheet in front of a slit, the position of zero path difference on the screen changes. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
Given below are two statements:
| Statement I: | No sustained interference pattern is obtained when two electric bulbs of the same power are taken. |
| Statement II: | Phase difference between waves coming out of electric bulbs is not constant. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
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