Question

Assertion: A white source of light during interference forms only white and black fringes. Reason: Width of fringe is inversely proportional to the wavelength of the light used.

• A. If both assertion and reason are true but the reason is the correct explanation of assertion
• B. If both assertion and reason are true but the reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both the assertion and reason are false
• E. If reason is true but assertion is false

Answer 1

The correct option is D If both the assertion and reason are false

A white source of light during interference will form coloured fringes.
Fringe width is given by $\beta =\frac{\lambda D}{d}$ i.e., it is directly proportional to wavelength.