With the increase in wavelength of the interfering beam, the fringe width in Young's double-slit experiment:
 1 decreases 2 increases 3 remains the same 4 can increase or can decrease
Subtopic: Â Young's Double Slit Experiment |
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Given below are two statements:

 Assertion (A): In Young's double-slit experiment the two slits are at a distance d apart. The interference pattern is observed on a screen at a distance D from the slits and a dark fringe is observed. The wavelength of the wave is proportional to the square of the distance between two slits. Reason (R): For a dark fringe, intensity is 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.
Subtopic: Â Young's Double Slit Experiment |
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Two Sources $$S_1$$ and $$S_2$$ of intensity $$I_1$$ and $$I_2$$ are in front of a screen [Fig.(a)]. The pattern of intensity distribution seen in the central portion is given by Fig.(b).

In this case, which of the following statements are true?

 (a) $$S_1$$ and $$S_2$$ have the same intensities. (b) $$S_1$$ and $$S_2$$ have a constant phase difference. (c) $$S_1$$ and $$S_2$$ have the same phase. (d) $$S_1$$ and $$S_2$$ have the same wavelength.

Choose the correct option:

 1 (a), (b), (c) 2 (a), (b), (d) 3 (b), (c), (d) 4 (c), (d)
Subtopic: Â Young's Double Slit Experiment |
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White light is used to illuminate the double slit in Young's double-slit experiment. Which of the following is/are true?
 I. The central fringe will be white. II. Closest bright fringe to the central fringe will be a violet fringe. III. There will not be any dark fringe.
1. I only
2. I, II
3. I, III
4. I, II, III
Subtopic: Â Young's Double Slit Experiment |
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Assertion: For best contrast between maxima and minima in the interference pattern of Young's double slit experiment, the intensity of light emerging out of the two slits should be equal.
Reason: The intensity of the interference pattern is proportional to square of amplitude.

1. Both the assertion and the reason are true and the reason is a correct explanation of the assertion.
2. Both the assertion and reason are true but the reason is not a correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both the assertion and reason are false.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false
Subtopic: Â Young's Double Slit Experiment |
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