Problem 26.35 A laser beam of wavelength 550nm is incident normally on a transmi

Question

Problem 26.35 A laser beam of wavelength 550nm is incident normally on a transmission grating having 380lines/nm. Part A Find the angles of deviation in the first, second, and third orders of bright spots. Problem 26.35 A laser beam of wavelength 550nm is incident normally on a transmission grating having 380lines/nm. Part A Find the angles of deviation in the first, second, and third orders of bright spots. A laser beam of wavelength 550nm is incident normally on a transmission grating having 380lines/nm. Part A Find the angles of deviation in the first, second, and third orders of bright spots. Part A Find the angles of deviation in the first, second, and third orders of bright spots.

Explanation / Answer

Apply dsin(angle) = m(wavelength)

d is the imverse of the lines per nm, converted to meters

d = 2.63 X 10^-6

(2.63 X 10^-6)(sin angle) = (1)(550 X 10^-9)

Angle is 12.06 degrees for the first order

(2.63 X 10^-6)(sin angle) = (2)(550 X 10^-9)

Angle is 24.7 degrees for the second order

(2.63 X 10^-6)(sin angle) = (3)(550 X 10^-9)

Angle is 38.8 degrees for the third order

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