150db in an tube of .6m length and 4cm diameter produce 100 watts of power
150db in an tube of .6m length and 4cm diameter produce 100 watts of power

In viewing through a magnifying glass, one usually positions one's eyes very close to the lens. Does angular magnification change if the eye is moved back?
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Last Activity: 3 Years ago

Last Activity: 3 Years ago

Last Activity: 3 Years ago

Last Activity: 3 Years ago