Question

In: Physics

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?

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 2 years ago

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