Question

A diffraction pattern is obtained by using a beam of red light. If the red light is replaced by the blue light, then

• A. bands will be narrower
• B. bands become broader
• C. no change in the width of the bands takes place
• D. bands disappear

Hint:

In diffraction patterns, shorter wavelengths produce narrower fringes.

Answer 1

The Correct Option is A

In diffraction, the angular width of the diffraction pattern is inversely proportional to the wavelength of the light used. Since blue light has a shorter wavelength than red light, the bands will become narrower. Thus, the correct answer is: \[ \boxed{\text{bands will be narrower}} \]