Light from Two Sources $\lambda$ ₁ = 623 Nm And $\lambda$ ₂ = 488 Nm, Is Incident on a Diffraction Grating

question 6

Multiple Choice

Light from two sources, $\lambda$ ₁ = 623 nm and $\lambda$ ₂ = 488 nm, is incident on a diffraction grating that has 5550 lines/cm. What is the angular separation, $\theta$ ₁ - $\theta$ ₂, of the second order maxima of the two waves?

• A)11.0°
• B)15.0°
• C)25.0°
• D)32.8°
• E)43.8°