1. What is diffraction? 2. Diode laser light ( λ = 670 nm) falls on single...

1. What is diffraction?

2. Diode laser light ( λ = 670 nm) falls on single slit with the width of slit 0.04 mm. If a screen is 1.05 m away from the slit, what is Δy1↔1 the distance between the first dark (m=1) above the central bright and the first dark (m=1) below the central bright?

3. What is interference?

4. Diode laser light ( λ = 670 nm) falls on double slits spaced 0.25 mm. If a screen is 1.05 m away from the slits, what is the distance between the first and second bright fringes

Expert Solution

(1)
Diffraction refers to various phenomena which occur when a wave encounters an obstacle or a slit. It is defined as the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle.

(2)
d = 0.04 * 10^-3 m
L = 1.05 m
λ = 670 nm = 670 * 10^-9 m

x = (L*λ)/d
x = (1.05 * 670 * 10^-9 ) / (0.04 * 10^-3)
x = 0.0176 m

(3)
Interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude. Interference usually refers to the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves.
Eg :- light, radio, acoustic, surface water waves or matter waves.

(4)
Distance btw the 1st and 2nd Bright fringe = (λ*D)/d
Distance btw the 1st and 2nd Bright fringe = (670 * 10^-9 * 1.05)/(0.25 * 10^-3)
Distance btw the 1st and 2nd Bright fringe = 0.0028 m

genius_generous answered 2 years ago

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