Interference and diffraction of light
Answers are for parents and teachers.
1
λ = 500 nm, d = 0.5 mm, L = 2 m. What is Δy in Young's experiment, in mm?
2
2
A grating has 500 lines/mm. What is its period d in μm?
2
3
d = 2 μm and λ = 500 nm. Up to what maximum order can maxima be seen at most? (n < d/λ)
3
4
In Newton's rings λ = 500 nm and R = 2 m. What is the radius r = √(mλR) of the dark ring with m = 2 in mm?
1.41
5
Why is the diffraction of light rarely noticeable in everyday life?
The wavelength of light (≈ 0.5 μm) is much smaller than everyday objects; for noticeable diffraction the obstacle must be comparable to λ.