1. Give one use of microwave and one use of ultraviolet

2. Calculate the wavelength of a radio wave with a frequency of 92.5 Hz. [speed of light = 3.0 x 10⁸ m/s]

3. A ray of light hits a plane mirror with an incident angle of 72⁰. Draw the ray diagram complete with the normal line and reflected ray.

4. The diagram shows a ray of light entering a prism.