Question

The spacing between the slits of a diffraction grating is 1600 nm (1 nm = 10-9 m). How many lines per mm does this grating have?

Answer 1

Step-by-step explanation:

It is given that,

Slit spacing,
`d=1600\ nm=1600* 10^(-9)\ m`

We need to find the lines per mm in the grating. The relation between the slit spacing and number of lines is given by :

`N=(1)/(d)`

`N=(1)/(1600* 10^(-9))`

N = 625000 m

or

So, number of lines per mm is 625. Hence, this is the required solution.