Q.

What is the phenomenon of light travelling in a straight line called?

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a

Dispersion of light

b

Refraction of light

c

Rectilinear propagation of light

d

Reflection of light

answer is B.

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Detailed Solution

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 The phenomenon that light travels in a straight line is called rectilinear propagation of light. 

A ray can be shown by a straight line with an arrowhead showing the direction in which light is travelling.

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What is the phenomenon of light travelling in a straight line called?