NASA Explains Why James Webb Space Telescope Uses ‘Salted’ Lenses
In the event that NASA completes all the major installations of its James Webb Space Telescope and the telescope is in”cooling” or “cooling” period, the agency has revealed some fascinating information about its $10 billion (roughly equivalent to the equivalent of Rs. 74,100 of core) observatory. Some lenses are made from salt. Why does this infrared telescope require a “salty” lens? In a video released today, researchers working on the telescope discussed the importance of salt for this deep-space observatory.
There are a variety of lenses. Mirrors are reflective lenses that bend light. However, some lenses allow light to be able to pass through them. The second type of lenses is referred to as transmissive lenses. In the case of James Webb, infrared light is different from visible light and plays an essential part. There are a variety of lenses. Mirrors are reflective lenses that bend light. However, some lenses allow light to be able to pass through them.
NASA’s narration states, “Salts are more than something you sprinkle on your food.” Salt is a mixture of two positively charged elements and a negatively charged halide. They acquire their charge by either losing or getting an electron that is negatively charged. The type of salt we eat is sodium chloride. However, it’s not the only kind of salt available. Other types include lithium fluoride, Barium fluoride and zinc selenide.
But in the longer term, the lenses could be impacted by space debris, including micrometeoroids.
NASA Goddard Space Flight Center scientist Michelle Thaller said during a Livestream that tiny micrometeorites’ impacts are likely to occur.But, NASA scientists say they have considered this since the telescope was designed to last ten years. They have contingency plans to prepare for this inevitable event.
Sunshield’s five layers don’t just shield the telescope from radiation but also dust and other debris. However, a micrometeoroid may come from the side and damage any area of the telescope. If a mirror has been damaged, it is taken care of.
NASA launched the James Webb Space Telescope on December 25, but for the past two days, it’s been trying to unfold it widely. It has completed significant deployments such as the primary and secondary mirrors.
What optics does the James Webb Telescope use?
JWST’s optical design is a three-mirror anastigmat, which makes use of curved secondary and tertiary mirrors to deliver images that are free from optical aberrations over a wide field.
What type of light does the James Webb telescope see?
The JWST actually looks at two ranges of infrared light: the near infrared and mid-infrared. The near infrared is light with wavelengths very close to visible red light. It’s the wavelength that your TV remote uses (if you can find it—it’s probably under the couch cushions).
How Far Will James Webb see?
How far back will Webb see? Webb will be able to see what the universe looked like around a quarter of a billion years (possibly back to 100 million years) after the Big Bang, when the first stars and galaxies started to form.