a ray of light passing from one medium to another does not band it's a path if its angle of incidence equal_________ degree.
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Answer:
90°
Explanation:
A ray of light passing from one medium to another do not bend or deviate when the angle of incidence is 90°
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Answer:
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Explanation:
A steamer goes downstream form one point to another in 6 hours. It covers the same distance upstream in 7 hours. If the speed of the stream is 2 km/hr, find the speed of the steamer in still water.
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