What Is the Angular Separation of Two Spectral Lines of Wavelengths

question 87

Multiple Choice

What is the angular separation of two spectral lines of wavelengths $497 \mathrm {~nm}$ and $251 \mathrm {~nm}$ formed in the third order with a diffracting grating having 587 lines per millimeter?

• A) \(34.8 ^ { \circ }\)
• B) \(4.21 ^ { \circ }\)
• C) \(29.4 ^ { \circ }\)
• D) \(41.3 ^ { \circ }\)
• E) \(24.8 ^ { \circ }\)

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