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Lecture

lecture 21


Department
Astronomy
Course Code
ASTA01H3
Professor
Lowman

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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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