A laser beam of wavelength 550 nm is incident normally on a transmission grating

Question

A laser beam of wavelength 550 nm is incident normally on a transmission grating having 400 lines/mm .

Part A

Find the angles of deviation in the first, second, and third orders of bright spots.

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Part B

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Part C

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A laser beam of wavelength 550 nm is incident normally on a transmission grating having 400 lines/mm .

Part A

Find the angles of deviation in the first, second, and third orders of bright spots.

|1| =

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Part B

|2| =

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Part C

|3| =

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Explanation / Answer

m lambda = d sin theta

where d is the distance between each slit,

m is the order.

lambda is wavelength,

and theta is the angle you are looking for.

theta = arcsine (m (lambda)*(1/d))

In this case, d needs to be found. since their are 440 lines per millimeter, you would divide 1 by 440 to get 0.002277 millimeters, or 2.27*10^-6 meters.

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