Question

Which of the following statement (s) is/are true about interference pattern due to double slits?
I. The interference pattern has equal number of bright and dark band width .
II. The pattern is obtained by superposition of two waves originating from the two narrow slits which are coherent.
III. We get a minima at an angle of $\lambda /3a$ where ' $a$ ' is the distance between two slits
IV. Fringes have equal intensity in interference pattern due to double slits.

• A. I only
• B. II only
• C. I, II and IV
• D. I, II and III

Answer 1

Answer: (C)

The double slit interference pattern has a central maxima followed by minima. The dark and bright fringes are of equal width and intensity.