Question
Answer the following questions:
(a) In a double slit experiment using light of wavelength 600 nm, the angular width of the fringe formed on a distant screen is 0.1°. Find the spacing between the two slits.
(b) Light of wavelength 5000 Å propagating in air gets partly reflected from the surface of water. How will the wavelengths and frequencies of the reflected and refracted light be affected?Solution
Wavelength of light, 
Angular width of the fringe, 
Using the formula, 
Spacing between the slits, 
b) Wavelength of light, 
Frequency of reflected and refracted light is going to be the same.
Therefore,
Frequency, 
This is the required frequency of both refracted and reflected light.
Refractive index of water, 
Therefore, wavelength of the refracted light,
