Constructive interference is expressed as:

$\overline{){\mathit{d}}{\mathbf{}}{\mathbf{s}}{\mathbf{i}}{\mathbf{n}}{\mathbf{}}{\mathbf{\theta}}{\mathbf{=}}{\mathbf{m}}{\mathbf{\lambda}}}$

Where d is the separation between the two slits, m is the order, and λ is the wavelength.

For small angles measured in radians, θ ≃ sin θ ≃ tan θ ≃ y/L

Figure Q17.7 shows the viewing screen in a double-slit experiment with monochromatic light.

Fringe C is the central maximum.

What will happen to the fringe if the wavelength of the light is decreased?

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