Consider a magnetic force acting on an electric charge in a uniform magnetic field. Which of the following statements are true?
1 answer:
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Answer:
Answered
Explanation:
The data given in the problem
Diameter of a human pupil=0.007 m=7 mm
Diameter of alien pupil=0.5=500 mm
Here we have to calculate the minimum distance at which the alien can see Betelgeuse i.e. the focal length (or the working distance). For this calculation we assume the eye to be a spherical lens.
The focal length and diameter of the lens are related by the formula Where r is radius of curvature i.e. d/2
Therefore for the alien, focal length==12.5mm=0.0125