Wave Optics - Result Question 19
19. If yellow light emitted by sodium lamp in Young’s double slit experiment is replaced by a monochromatic blue light of the same intensity
(a) fringe width will decrease
[1992]
(b) finge width will increase
(c) fringe width will remain unchanged
(d) fringes will become less intense
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Answer:
Correct Answer: 19. (a)
Solution:
- (a) As $\beta=\frac{\lambda D}{d}$ and $\lambda_b<\lambda_y$,
Fringe width $\beta$ will decrease
