There are many types of lenses. Mirrors are reflective lenses. It turns the light. Whereas transmissive lenses allow light to pass through them. Infrared light behaves differently from ‘visible light’ for the James Webb Telescope and plays an important role for this observatory. Importantly, glass absorbs infrared light, but salt does not.
It has been told in NASA’s video that salt is more useful than it is used in food. According to scientists, salt is a combination of a positively charged element and a negatively charged halide. The salt we eat is sodium chloride. Apart from this, there are many types of salt also. For example, lithium fluoride, barium fluoride and zinc selenide.
However, these lenses are also at risk from space debris during long hours of operation. These also include micrometeoroids.
NASA’s Goddard Space Flight Center scientist Michelle Thaler said during a livestream that smaller meteorites are bound to have smaller impacts. Although NASA scientists say that this telescope is going to last for 10 years. He said he has plans to deal with any situation.
The five layers of sunshield not only protect the telescope from heat but also dust and debris. However, a small meteorite can come from any side and damage any part of the telescope.
NASA launched James Webb on 25 December. He’s been setting it in space for the past two weeks. It has completed its important deployment. James Webb is the largest telescope ever built. Its purpose is to help astronomers make successful discoveries. This project has been started jointly by NASA, European Space Agency and Canadian Space Agency.
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