I tried 1.87 and 2.0 as well. But always within 10%. help! Intense white light i

Question

I tried 1.87 and 2.0 as well. But always within 10%. help! Intense white light is incident on a diffraction grating thathas 765 lines/mm. (a) What is the highest order in which the complete visiblespectrum can be seen with this grating? (Enter 1 for first order, 2for second order, etc.) Your response differs from the correct answerby more than 10%. Double check your calculations. (b) What is the angular separation between the violet edge (400 nm)and the red edge (700 nm) of the first order spectrum produced bythe grating? I tried 1.87 and 2.0 as well. But always within 10%. help!

Explanation / Answer

d = 1/765 mm, dsin = m sin = m/d < 1 m

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