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Magnification and Useful Power
Grade Level
Astronomy
AST.080 Magnification and Useful Power
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During a science fair demonstration, a telescope with a 1440 mm focal length is used with a 24 mm eyepiece to view a lunar crater. Which option gives the correct magnification and a valid claim about using much more magnification?
A
30x; a higher-power eyepiece increases the telescope's aperture and light-gathering area
B
61x; digital zoom or a stronger eyepiece can create resolution that the telescope did not collect
C
60x; going well above useful power can make the view larger but dimmer and blurrier without adding new detail
D
120x; useful power depends only on the eyepiece label and not on seeing or aperture
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