CBSE Class 12 Physics 2023 Outside Delhi Set 1 Paper

Question : 22

Total: 35

What happens to the interference pattern when two coherent sources are
(a) infinitely close, and
(b) far apart from each other

Solution: 👈: Video Solution

Interference fringe width is given by
β2=λ‌

So, β∝‌

(i) If the coherent sources are infinitely close then the fringe width will be so large that a single fringe will occupy the whole screen. So, no interference pattern will be detected.

(ii) If the coherent sources are far apart, then d is very large. So, the fringe width will be so small that those cannot be resolved separately. So, no interference pattern will be detected.

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