In the experiment, you will determine the wavelength of a laser by shining the laser beam on a diffraction grating, a set of regularly spaced lines. if the screen is 10 m away, the spots are 5.4 cm apart, and the lines of the grating are separated by 0.1 mm,
what is (in nm)?

The wavelength is 539 nm.

Explanation:

Given that,

Distance of screen L= 10 m

Width s= 5.4 cm

Grating separation d= 0.1 mm

Suppose the pattern is displayed on a screen a distance L from the grating and the spots are separated by s. we need to find the wavelength.

The angle between the central and first maximum is given as

We need to calculate the wavelength

The condition for maximum of a diffraction grating is

Put the value into the formula

Hence, The wavelength is 539 nm.

the total distance traveled by the car is

30km + 49km = 79 km .