Question

A group of students uses an intense white light and a red filter to create brightfringes in a double-slit experiment. Describe the differences in the observedresults when the students make the following changes, and explain thedifferences.(a) Move the screen closer towards the slits.(b) Replace the red filter with a blue filter.

Answer 1

a) When the screen is moved closer towards the slit, the interference fringes will overlap on one another, resulting in an interference pattern that is less sharp and has low intensity

b) When the red filter is replaced with a blue filter, the width of the fringes would decrease. This means that the fringes would be closer and the pattern becomes narrower.