NASA explains why the James Webb Space Telescope uses ‘salted’ lenses


As NASA completes all major deployments of the James Webb Space Telescope and the observatory enters a “cooling down” period, the agency is sharing some interesting facts about the $10 billion observatory (about Rs 74,100). based). These include lentils made from salt. But why does this infrared telescope need a “salted” lens? In a new video, scientists working on the telescope explained why salt is vital to the deep space observatory. And the James Webb Telescope uses not just one but three types of salt lenses.

There are different types of lenses. Mirrors are reflective lenses that bend light, but some let light pass through them. These second types of lenses are called transmissive lenses. For James Webb, infrared light, which behaves differently from visible light, plays an essential role. The key here is this: glass absorbs infrared light, but not salt.

The narrator in from NASA The video says, “Salts are more than something you sprinkle on your food.” A salt is a combination of a positively charged element and a negatively charged halide. They get their charge by losing or gaining a negatively charged electron. The salt we usually consume is sodium chloride, but it is not the only type of salt. Some other types are: lithium fluoride, barium fluoride, and zinc selenide.

However, in the long term, these lenses are threatened by space debris, including micrometeoroids.

NASA Goddard Space Flight Center scientist Michelle Thaller said during a direct that small impacts of micrometeorites are inevitable. However, NASA scientists say they took this factor into account because the telescope is supposed to last 10 years. They said they had contingency plans in place to deal with this fatality.

The five layers of the sun shield not only protect the telescope from heat but also from dust and debris. But a micrometeoroid can come from any side and damage any part of the telescope. If a mirror is damaged, it can be counted.

Nasa spear The James Webb Space Telescope on December 25 and for the past two weeks has been working to deploy it in space. He has carried out major deployments such as the primary and secondary shimmer.


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