Question

The colour of bright fringe nearest to 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

As $\beta$ = $\frac{\lambda D}{d}$ $\therefore$ $\beta \alpha \lambda$
As $\lambda$ for violet is least, therefore, fringe nearest to central achromatic fringe will be violet