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Consider a Young’s double slit experiment as shown in figure. What should be the slit separation d in terms of wavelength λ such that the first minima occurs directly in front of the slit (S 1 ) ? S 1 S 2 2d d P Screen Source 1 st minima

1. ) 2 5 ( 2 − λ
2. ) 2 5 ( 2 − λ
3. ) 2 5 ( − λ
4. ) 2 5 ( − λ

Correct answer: ) 2 5 ( 2 − λ

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