Sample Diffraction Grating |
Below is here's what happens in the diffraction grating,
The diffraction grating formula for the principle maxima is as follows,
$$dsin(\theta_{n})=n\lambda$$
Where, $d$=distance between the slits
$\theta$= angle to the principle maxima
$n$= integer number to next bright fringe
$\lambda$= wavelength of the incident light
piccourtesy:http://www.pstcc.edu/nbs/WebPhysics |
Examples: A monochromatic light of wavelength $5.0\times 10^{-7}m$ is incident normally on a plane diffraction grating and second-order bright lights emerge at angles of $30^{0}$ to the normal to the grating. Calculate the number of lines per millimeter of the grating. Ans: $500$
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