An engineer uses a laser alignment system to steer a beam around a protective barrier. The system contains two flat parallel mirrors, as shown in the diagram.
a.[3]
Complete the ray diagram to show how the laser beam passes through the alignment system from the incoming path to the laser sensor target.
You must:
- Draw the path of the laser beam after reflecting from Mirror 1 to Mirror 2, and then to the laser sensor target.
- Draw the normal line at the point of incidence on Mirror 2.
b.[3]
The alignment system is used near a wave tank to monitor wave behaviour.
A sensor counts 36 complete wave crests passing a fixed marker in 1.5 minutes. Calculate the time period of one wave in seconds.
c.[2]
A different wave in the tank has a frequency of 0.8 Hz0.8\text{ Hz}0.8 Hz and a wavelength of 22.5 m22.5\text{ m}22.5 m. Calculate the speed of this wave.