Q. No.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: | 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:
| 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. |
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:
| 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. |
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. |
Given below are two statements:
| Statement I: | The maximum intensity in YDSE is four times the intensity due to each slit when they are identical. |
| Statement II: | The phase difference between the interfering waves is \(2n\pi\) at the position of maxima where n = 0, 1, 2,... |
| 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 a YDSE, let X and Y be the upper and lower slits. A thin film of thickness t and refractive index is placed in front of X. Let = fringe width. The central maximum will shift
1. Downward
2. Upward
3. By
4. Both (2) & (3)
Huygen's principle for secondary wavelets may be used to:
| 1. | explain Snell's law. |
| 2. | find the velocity of light in vacuum. |
| 3. | find a new position of a wavefront. |
| 4. | both (1) & (3) are correct. |
In Young's double-slit experiment, an electron beam is used to obtain an interference pattern. If the speed of electrons is increased:
| 1. | No interference pattern will be observed. |
| 2. | Distance between two consecutive fringes remains the same. |
| 3. | Distance between two consecutive fringes will decrease. |
| 4. | Distance between two consecutive fringes will increase. |
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