14) Waves need a medium to travel through. Describe how it is possible for electromagnetic waves to propagate through a vacuum, such as space

15) How do polarized lenses reduce glare? Describe a situation where glare would not be reduced by polarized lenses.

16)Explain why the screen on a microwave oven is metallic and features many small holes.

(please try genuinely explaining each and not just copy and pasting from google, thank you so much!)