In a double-slit experiment nm, the slit separation is 0.4 mm and the screen is 2 m away. What is the fringe spacing?
Answer and explanation
Correct answer: D. 3 mm
- Step 1: Fringe spacing . Step 2. m. Answer: 3 mm. Why not the others: 0.3 mm and 30 mm are power-of-ten slips; 12 mm uses d in the wrong unit.
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