The Distance Between the Ruled Lines on a Diffraction Grating $1900 \mathrm {~nm}$

question 19

Multiple Choice

The distance between the ruled lines on a diffraction grating is $1900 \mathrm {~nm}$ . The grating is illuminated at normal incidence with a parallel beam of white light in the $400 \mathrm {~nm}$ to $700 \mathrm {~nm}$ wavelength band. What is the angular width of the gap between the first order spectrum and the second order spectrum?

• A) \(6.3 ^ { \circ }\)
• B) \(4.3 ^ { \circ }\)
• C) \(5.3 ^ { \circ }\)
• D) \(2.3 ^ { \circ }\)
• E) \(3.3 ^ { \circ }\)

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