A diffraction grating has 500 lines per millimeter. What is the highest order of diffraction () observable for red laser light of wavelength 650 nm?
Answer and explanation
Correct answer: B.
- Step 1: Grating spacing: .
- Step 2: Grating equation: . Maximum angle is .
- Step 3: .
- Step 4: Since order must be an integer: .
Answer
3.
Why not the others: '' would require which is physically impossible; '' is not the highest order.
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