a laser beam passes through a diffraction grating and the second- order bright spot is produced...

a laser beam passes through a diffraction grating and the second- order bright spot is produced at an angle of 22.0 degree from the main central axis. What is the highest order bright spot that can be produced by this arrangement?

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Expert Solution

In a laser diffraction experiment, the condition for constructive interference or bright spot is as shown below.

here d is the distance between the slits in the grating ,m is the order of maximum , is the angle between the maximum point and the central point and is the wavelength.

For a given grating set up, d and will be a constant.

In the question it is given that for m=2 ,

i.e.,

The maximum grating that can happen is for

Corresponding highest order can be calculated as

Hence highest order grating possible is 5th order i.e., m=5

genius_generous answered 1 year ago

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