Context

• Recently ISRO released an image from Chandrayaan-2 showing measurements from the Moon, carried out by the instrument Imaging Infrared  Spectrometer (IIRS).

Details:

• IIRS is designed to measure light from the lunar surface in narrow spectral bands. It has the ability to split and disperse reflected sunlight and its emitted component into these spectral bands.
• From the reflected solar spectrum, scientists will look for signatures, including minerals. This will help map the lunar surface composition, which in turn will help us understand the Moon’s origin and evolution in a geologic context.
• The science of spectroscopy grew from the well-known fact of how visible light can disperse into rainbow colours after passing through a prism. 
• Today it has extended to include the study of the interaction between matter and electromagnetic radiation.

Source: IE