Adiffraction grating with 355 lines/mm is 1.2 m in front of a screen. what is the wavelength of light whose first-order maxima will be 16.4 cm from the central maximum on the screen?

The wavelength of light is 381 nm.

Explanation:

Given that,

Distance of screen D= 1.2 m

Diffraction grating = 355 lines/mm

Order m= first

Distance from the central maximum on the screen y= 16.5 cm

We need to calculate the width of slits

We need to calculate the angle

Using formula of distance

Put the value into the formula

We need to calculate the wave length

Using formula of wavelength

Put the value into the formula

Hence, The wavelength of light is 381 nm.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.