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Refracting Telescopes
· A refracting telescope works by having two converging lenses of different
powers set in line with each other. The lenses can be moved towards or
away from each other to focus the image.
· The smaller lens is called the eyepiece and the larger lens is called the
objective lens. The light gathering power of the telescope is given by D
which is the diameter of the lens.
· A refracting telescope works by having two converging lenses of different
powers set in line with each other. The lenses can be moved towards or
away from each other to focus the image. The smaller lens is called the
eyepiece and the larger lens is called the objective lens. The light
gathering power of the telescope is given by D which is the diameter of
the lens.
objective
eyepiece…read more

Slide 3

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Law of Refraction
Angle of incidence = angle of refraction
Incident ray
Reflection of ray
normal…read more

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Reflecting Telescopes
· The reflecting telescope designed by Isaac Newton has a large concave mirror
to collect reflected light from a distant object like a planet in our solar system.
· The concave mirror also converges the light to a small plane mirror for the
observers eye. The eye lens acts like a magnifying glass to increase the size of
the virtual image. Reflecting telescopes have the advantage over refracting
telescopes of having bigger mirrors without the image disorting.…read more

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Hubble Telescope
The Hubble telescope Distance = speed of recession
launched in 1996 by the
hubble constant
shuttle program is in a fixed
orbit outside the Earth's
atmosphere. In order to Hubble constant = speed of recession
take images of distant, faint distance
objects, Hubble must be
extremely steady and Speed of recession = hubble constant x distance (km)
accurate. The telescope is
able to lock onto a target
without deviating more
than 7/1000th of an arc-
second, or about the width
of a human hair seen at a
distance of 1 mile.…read more

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Converging lenses
· A lens that can focus parallel · Converging lenses can be fat or
light rays into a single point is thin, the fatter a lens, the more
called a converging lens. Light it will refract (bend) the light as
bends as it passes through the it passes through it. A fat lens
lens, this is called refraction. A that can bend light a lot is said
refracting telescopes uses to have a high power.
lenses to gather and bend light Converging lenses are also used
as it passes though the in glasses for people who are
telescope to the observer. The long sighted, they bring distant
point at which the light rays objects into sharper focus.
meet in a single point is called
the focus.…read more

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