An astronaut is looking down on earth’s surface from a space shuttle at an altitude of 400km. Assuming that the astronauts pupil diameter is 5mm and the wavelength of visible light is 500nm , the astronaut will be able to resolve linear objects of the size about A)0.5m B)5m C)50m D)500m answer is C

Question

Manas Bondale · Answer

The question should state the object location. Assume it to the earth surface.
Practical formula for eye’s limit of resolution =
Linear size of object / Distance to object
is equal to
1.22 * wavelength / aperture diameter.
.
The aperture diameter is the diameter of the pupil. Use a single unit for all distances.
Further explanation – hyperphysics.phy-astr.gsu.edu/hbase/phyopt/raylei.html

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