NASA Explains Why James Webb Space Telescope Uses 'Salty' Lenses SCIENCE NASA Explains Why James Webb Space Telescope Uses 'Salty' Lenses

As NASA completes all major deployments of the James Webb Space Telescope and the observatory enters a “cooling” period, the agency is sharing some interesting facts about the $10-billion (roughly Rs. 74,100 core) observatory. These include some lenses which are made out of salt. But why does this infrared telescope need a “salty” lens?

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