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Astronomy (53)
AS101 (52)
Chapter 4

Chapter 4 Textbook Definitions

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Department
Astronomy
Course
AS101
Professor
Shohini Ghose
Semester
Fall

Description
Chapter 4: Astronomical Telescope and Instruments Electromagnetic Radiation – changing electric and magnetic fields that travel through space and transfer energy from one place to another; ex. Light and radio waves Wavelength (λ) – the distance between successive peaks or troughs of a wave, usually represented by a lowercase Greek lambda Nanometre (nm) – a unit of distance equalling one-billionth of a metre, commonly used to measure the wavelength of light Angstrom (Å) – a unit of distance commonly used to measure the wavelength of light Infrared (IR) – the portion of the electromagnetic spectrum with wavelengths longer than red light, ranging from 700nm to about 1mm, between visible light and radio waves Ultraviolet (UV) – the portion of the electromagnetic spectrum with wavelengths shorter than violet light, between visible light and X-rays X-rays – electromagnetic waves with wavelengths shorter than ultraviolet light Gamma Rays – the shortest-wavelength electromagnetic waves Photon – a quantum of electromagnetic energy that carries an amount of energy that increases proportionally with its frequency but decreases proportionally with its wavelength Atmospheric Window – wavelength region in which our atmosphere is transparent – at visual, radio, and some infrared wavelengths Refracting Telescope – a telescope that forms images by bending (refracting) light with a lens Reflecting Telescope – a telescope that forms images by reflecting light with a mirror Primary Lens – in a refracting telescope , the largest lens Primary Mirror – in a reflecting telescope, the largest mirror Eyepiece – a short-focal-length lens used to enlarge the image in a telescope; the lens nearest the eye Focal Length – the focal length of a lens or mirror is the distance from the lens or mirror to the point where it focuses parallel rays of light Chromatic Aberration – a distortion found in refracting telescopes because lenses focus different colours at slightly different distances; images are consequently surrounded by colour fringes Optical Telescope – telescope that gathers visible light Radio Telescope
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