**diffraction grating**consists of a large number of fine, equidistant, closely spaced parallel lines of equal width, ruled on polished metal.

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 |

**easy to understand derivation**for diffraction grating,

**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.**

*Examples:***Ans: $500$**

## No comments:

Post a Comment