Vanishing Act

Invisible World

Do you believe things can be made invinsible? If you don't, I am now going to to introduce you into a world of invisibility. There are a few types of invisibility cloaks. Firstly, I will be talking about the radar cloak. The radar cloaks purpose is to minimise detection by radar, which uses radio waves to detect objects. How? The cloak is created using materials and paint which absorb radar waves. It is only used on stealth planes, such as the F-22 Raptor and some Navy ships, such as the Singapore Navy. However, there are some limitations-- 1. Bad weather can increase chances of detection. 2. No radar-absorbent materials is effective for all radar bandwidths. Next, I will be talking on the Sonar Cloak, which basically absorbs sound so that ships and submarines are "hidden". There is one limitation-- 1. Active sonar can be absorbed at near distances. Lastly, I will be talking on the optical cloak, which can hide tanks and planes in plain sight! With the optical cloak, you can hide pipes and protrusions and hide the observer observing wildlife. However, the optical cloak can only currently work on micro and nano metre objects. The good news is that the optical cloak can start to cover bigger and bigger objects. What fun would we have playing with Harry Potter's "Invisibilty Cloak!" For now, it is only a dream, but someday, we will be able to.