Question

what are formed due to rectilinear propagation of light.​

Answer 1

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Generally, light travels in a straight line in a uniform transparent medium or in vacuum. This mode of propagation of light is called rectilinear propagation. This shadow is formed when the globe blocks bound by straight lines the light travelling in a straight line.

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Answer 2

Answer:

Generally, light travels in a straight line in a uniform transparent medium or in vacuum. This mode of propagation of light is called rectilinear propagation. ... This shadow is formed when the globe blocks bound by straight lines the light travelling in a straight line.