Question

A double sit produces a diffraction pattern that is a combination of single- and double-slit interference. Find the ratio of the width of the slits to the separation between them, if the first minimum of the single-slit pattern falls on the fifth maximum of the double-slit pattern.

(This will greatly reduce the intensity of the fifth maximum.) 

Select the correct answer 

• 0.100 

• 0.040

• 0.200 

• 0.500 

• 0.250

Answer 1

Solution: Consider the expression for single slit, ere.n-1 (1) Dsin θ λ Consider the expression for double slit, dsin9-5λ (2) Divide (1) and (2), dsin θ 5λ D 1 0.200 Thus, the slit is separated by 5 times the width of slit.