The light shining on a diffraction grating has a wavelength of 481 nm (in vacuum). The...
The light shining on a diffraction grating has a wavelength of 481 nm (in vacuum). The grating produces a second-order bright fringe whose position is defined by an angle of 8.59°. How many lines per centimeter does the grating have?
Homework Answers
Solution)
We know,
m λ = d sinθ
So,
d = m λ / sinθ = 2 * 481 nm /sin 8.59 = 6440.69nm = 0.0006440 cm perline
Now,
The number of lines per cm is the inverse -
Hence,
1 / 0.0006440 cm per line =1552.79 lines per cm
==============
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