Explain the principle behind the 10x level used to measure small weights
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There are 360 degrees in a circle
There are 2pi radians in a circle one degree is equal to 17.45 milliradians one arc-minute is 1/60 degrees one arc-second is 1/60 arc-minute, or 1/3600 degrees one arc-second is 4.85 microradians small angle approximation (works when using radians, milliradians or microradians) the sine of the angle theta is approximately equal to theta if theta is less than a few degrees sin(theta) ~= theta [radians] Add a graph here to show this! So, to figure a telescope field of view (which is small) divide the width of the field by the range to the field, and you have the FOV in radians. That is why radians are so useful. |
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