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refractive index 1.50 calculate the following when fiber is kept in water:

fractional refractive index, numerical aperture, acceptance angle and

number of modes The diameter of fiber is 15mm, it is operated at a

wavelength of 1.5 mm and its length is 10 Km.

One student took out a ruler and measured the image of the sun on the ground to have a diameter of 6 cm. Approximately how tall was the tree? Enter your answer in meters.