Lesson: Double-Slit DiffractionPhysics
In this lesson, we will learn how to calculate the characteristics of an interference pattern made by the diffraction of visible light through two slits.
Sample Question Videos
Worksheet: 14 Questions • 1 Video
A double slit produces a diffraction pattern that is a combination of single- and double-slit interference, where the first minimum of the single-slit pattern falls on the fifth maximum of the double-slit pattern. Find the ratio of the width of the slits to the distance between the slits.
When monochromatic light of wavelength 430 nm is incident on a double slit of slit separation 5 μm, there are 11 interference fringes in its central maximum. How many interference fringes will be in the central maximum of light of wavelength 632.8 nm for the same double slit?
White light falls on two narrow slits separated by 0.40 mm. The interference pattern is observed on a screen 3.0 m away. The light in the interference pattern includes red light of wavelength 400 nm, yellow light of wavelength 600 nm, and violet light of wavelength 700 nm.
What is the separation between the first maxima for the red light and the violet light?
What is the angular distance to the nearest point to the central maximum at which a maximum for the yellow light will coincide with a maximum for the violet light?
What orders of maxima of the yellow light and the violet light will coincide nearest the central maximum?