Class12 MCQ Wave Optics

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Multiple-Choice Questions on Young's Double-Slit Experiment

1. Path Difference and Bright Fringe
a) Path difference = \( n\lambda \)
b) Path difference = \( (n + \frac{1}{2})\lambda \)
c) Path difference = \( \frac{\lambda}{2} \)
d) Path difference = \( \lambda \)
2. Effect of Increasing Wavelength
a) Increase
b) Decrease
c) Remain the same
d) Disappear
3. Fringe Visibility Condition
a) Incoherent
b) Coherent
c) Unpolarized
d) Of different wavelengths
4. Number of Fringes Calculation
If the distance between the slits is 0.2 mm and the screen is 1 m away, using light of wavelength 600 nm, what is the fringe spacing?
a) 3 mm
b) 2 mm
c) 1 mm
d) 0.5 mm
5. Dark Fringe Condition
a) Path difference = \( n\lambda \)
b) Path difference = \( (n + \frac{1}{2})\lambda \)
c) Path difference = \( \frac{\lambda}{4} \)
d) Path difference = \( \lambda \)
6. Effect of Increasing Slit Separation
If the separation between the slits is increased in Young's double-slit experiment, the fringe spacing will:
a) Increase
b) Decrease
c) Remain the same
d) Disappear
7. Central Maximum Brightness
The central maximum in a Young's double-slit experiment is:
a) Twice as bright as the other fringes
b) Half as bright as the other fringes
c) Equal in brightness to the other fringes
d) The brightest fringe
8. Wavelength and Fringe Visibility
For visible light fringes to be produced in Young's double-slit experiment, the wavelength of the light used must be:
a) Longer than the slit separation
b) Shorter than the slit separation
c) Equal to the slit separation
d) Irrelevant to the slit separation
9. Changing Medium
If the entire setup of Young's double-slit experiment is immersed in water (refractive index \( n \)), the fringe spacing will:
a) Increase by a factor of \( n \)
b) Decrease by a factor of \( n \)
c) Increase by a factor of \( n^2 \)
d) Decrease by a factor of \( n^2 \)
10. Width of Central Maximum
In Young's double-slit experiment, if the width of the central maximum is \( W \), then the width of the first-order maximum on either side is:
a) \( W \)
b) \( \frac{W}{2} \)
c) \( 2W \)
d) \( \frac{W}{4} \)

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