Aperture – the diameter of the primary mirror, or objective lens of a telescope
Diffract – the bending of light waves as they travel through openings
Frequency – the number of vibrations per second
Photon – a particle of electromagnetic radiation
Reflect – to bounce of the boundary between two mediums
Refract – when a wave bends as it passes from one medium to another
Spectroscope – a device that separates EMR into its component parts
Telescope – a device used to enlarge images of distant objects
Wavelength – the distance from one point on a wave to the same point on an adjacent wave
From Georgia Virtual Learning Astronomy