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Reflecting
Telescopes
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Principle of reflection:
angle of reflection equals angle of incidence
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angles measured relative
to the perpendicular to the surface
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Newton found that curved
mirrors cause light to focus
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Types of reflecting telescopes:
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a) Newtonian--popular
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b) prime focus--how
big would the primary have to be for you to be at the prime focus?
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c) Cassegrain--popular
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d) Coude--for special
instruments that are too heavy to move with the telescope
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Secondary mirrors don't make
a hole in the image
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Magnification
= FL(primary) / FL(eye)
Reflection
Schematic
Focusing
reflector
Reflecting
Telescope Schematics
Secondary
doesn't make a hole in image
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