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ASTA01H3 (78)
Lecture

Lecture 21 and 22

3 Pages
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Department
Astronomy
Course Code
ASTA01H3
Professor
Rick Halpern

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Lecture 21: Telescopes
oTime machines
oWorks by gathering light bigger the telescope more light it can
gather
oImages formed by reflection or refraction
oFocus of primary mirror is called primary focus
oReflecting mirror
oImage Formation
oLight rays of the each region of the source are parallel which
are focused into a common point
oImage is formed upside down
oTelescope Design
oBy bending light through different angles a lens can be used
to focus the light
o
o
oIn both cases the image formed is viewed with a small
magnifying lens called the eyepiece
oChromatic aberration
Differential refraction as light pass through a lens
Problem with refraction telescope:
Focal length of red, green and blue light differs
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Description
Lecture 21: Telescopes o Time machines o Works by gathering light bigger the telescope more light it can gather o Images formed by reflection or refraction o Focus of primary mirror is called primary focus o Reflecting mirror o Image Formation o Light rays of the each region of the source are parallel which are focused into a common point o Image is formed upside down o Telescope Design o By bending light through differe
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