Young's Double-Slit Experiment: Interference Patterns
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10 Terms
Interference pattern with increased wavelength
The fringes spread farther apart
Effect of decreased slit separation (d)
Fringe spacing increases
Use of monochromatic light source in Young's experiment
It ensures a clear and stable interference pattern
Condition for constructive interference
Path difference between waves is a multiple of the wavelength (0, λ, 2λ, ...)
Reason for dimming bright fringes
One of the slits is partially blocked
Effect of increasing distance (L) between slits and screen
The fringes spread farther apart
Meaning of a 'missing order'
A bright fringe that is missing because of overlap with a dark fringe from diffraction
Pattern observed with white light
A series of colored fringes, like a rainbow pattern
Assumption of screen being far from slits
To simplify the mathematical analysis and get clear fringes
Advantage of using a lens at the focal point
It brings the far-field pattern closer for easier observation
Note 
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