In Young's double-slit experiment, slits are separated by 0,2 mm and the screen is placed 1,0 m away. If the 3rd dark fringe appears 7,5 mm from the central maximum, what is the wavelength of the light?
Answer and explanation
Correct answer: D. 600 nm
- Step 1: Condition for -th dark fringe: . For 3rd dark fringe, , factor is . Step 2. . Step 3. nm. Answer: 600 nm. Why not the others: mm yields nm.
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