Question

The colour of bright fringes nearest to the central achromatic fringe in the interference pattern with white light will be

• A. violet
• B. red
• C. green
• D. yellow

Answer 1

The correct option is A violet

To observe an interference pattern
$\frac{dy}{D}=n\lambda$
$y=\frac{nD\lambda }{d}$
i.e, for the bright fringes nearest the central achromatic fringe , wavelength must be minimum and in white light wavelength is minimum for $violet$
option $A$ is correct