Wave OpticsMedium
Question
An astronaut is looking down on earth′s surface from a space shuttle an altitude of 400 km. Assuming that the astronaut′s pupil diameter is 5mm and the wavelength of viable light is 500 nm, the astronaut will be able to resolve linear objects of the size of about :
Options
A.0.5 m
B.5 m
C.500 m
D.2 cm
Solution
The resolving power of an instrument is give by the formula 1.22 = 
Here, d is aperture of the instrument, D is distance of satelite from the earth. Here eye is the optical instrument.
R.P. =
× 400 × 1000
= 1.22 ×
× 4 = 1.22 × 40 = 50m
Here, d is aperture of the instrument, D is distance of satelite from the earth. Here eye is the optical instrument.
R.P. =
× 400 × 1000= 1.22 ×
× 4 = 1.22 × 40 = 50mCreate a free account to view solution
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