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cross section of a refracting telescopeclick to hear

Magnification depends on the length of the main tube and the size and composition of the lens system.
cross section of a refracting telescope eyepiece main tube objective lens light

eyepiece click to hear

Lens or system of lenses meant to magnify the image when placed before the eye.

main tube click to hear

The barrel of a telescope housing the optical system; light rays travel through the main tube.

objective lens click to hear

Lens that captures light from the object observed and causes it to converge.

light click to hear

Emitted by a celestial body, light is captured by the objective lens and travels along the main tube until it reaches the eyepiece.