Two sources are called coherent if they produce waves:

 1 of equal wavelength 2 of equal velocity 3 having same shape of wavefront 4 having a constant phase difference

Subtopic: Â Young's Double Slit Experiment |
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Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is $$25.$$ The intensities of the sources are in the ratio:
1. $$25:1$$
2. $$5:1$$
3. $$9:4$$
4. $$625:1$$

Subtopic: Â Young's Double Slit Experiment |
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The slits in a Young's double-slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is $$I_0.$$ If one of the slits is closed, the intensity at this point will be:
1. $$I_0$$
2. $$I_0/4$$
3. $$I_0/2$$
4. $$4I_0$$

Subtopic: Â Young's Double Slit Experiment |
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Find the minimum order of a green fringe ($$\lambda = 500$$ nm) which overlaps a dark fringe of violet ($$\lambda = 400$$ nm) in a Young's double-slit experiment conducted with these two colours.
1. $$4$$
2. $$2$$
3. $$5$$
4. $$2.5$$
Subtopic: Â Young's Double Slit Experiment |
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Young's double-slit experiment is conducted with light of an unknown wavelength, the waves arriving at the central point on the screen are found to have a phase difference of $$\dfrac{\pi}{2}.$$ The closest maximum to the central point is formed behind one of the slits. The separation between the slits is $$d,$$ and the slit to screen separation is $$D.$$ The longest wavelength for this to happen is:
1. $$\dfrac{2d^2}{D}$$
2. $$\dfrac{2d^2}{3D}$$
3. $$\dfrac{d^2}{2D}$$
4. $$\dfrac{d^2}{6D}$$
Subtopic: Â Young's Double Slit Experiment |
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A monochromatic light of frequency $$500$$ THz is incident on the slits of a Young's double slit experiment. If the distance between the slits is $$0.2$$ mm and the screen is placed at a distance $$1$$ m from the slits, the width of $$10$$ fringes will be:
1. $$1.5$$ mm
2. $$15$$ mm
3. $$30$$ mm
4. $$3$$ mm

Subtopic: Â Young's Double Slit Experiment |
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NEET - 2022
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If the screen is moved away from the plane of the slits in Young's double slit experiment, then the:
1. angular separation of the fringes increases.
2. angular separation of the fringes decreases.
3. linear separation of the fringes increases.
4. linear separation of the fringes decreases.
Subtopic: Â Young's Double Slit Experiment |
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NEET - 2022
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Two slits are made one millimetre apart and the screen is placed one meter away. What is the fringe separation when blue-green light of wavelength $$500$$ nm is used?
1. $$0.5$$ mm
2. $$0.3$$ mm
3. $$0.05$$ mm
4. $$0.03$$ mm

Subtopic: Â Young's Double Slit Experiment |
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For Young's double-slit experiment, two statements are given below:
 Statement I: If screen is moved away from the plane of slits, angular separation of the fringes remains constant. Statement Ii: If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases.
In the light of the above statements, choose the correct answer from the options given below:
 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.
Subtopic: Â Young's Double Slit Experiment |
From NCERT
NEET - 2023
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Which of the following sources gives the best monochromatic light?
1. a candle
2. a bulb
3. a mercury tube
4. a laser

Subtopic: Â Young's Double Slit Experiment |
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