Answer:
The highest order spot is 5.33.
Step-by-step explanation:
Given that,
Angle = 22°
Order number = 2
In a laser diffraction experiment, the condition for constructive interference or bright spot is

Put the value into the formula



The maximum grating for

We need to calculate the highest order spot
Using formula of the highest order spot

Put the angle into the formula

Put the value into the formula


Hence,The highest order spot is 5.33.