What do you mean by “Rectilinear propagation of light”?

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Light travels in a straight line

Light travels in a curved path

Light exhibits dual nature of particle and wave

Light gets deviated when it moves in another medium

answer is A.

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Detailed Solution

Concept- To comprehend the combined meaning of the phrases rectilinear and propagation, you must first understand their individual meanings. The term "rectilinear" refers to a straight line, whereas "propagation" refers to the act or process of spreading. As a result, the term rectilinear light propagation refers to light that travels in a straight line.
Light travels in a straight line at all times. In the following scenarios, it deviates from its path: When light collides with an obstruction, it alters its path in the same medium. Reflection is the term for this phenomenon. When light moves from one medium to another, it takes a different route in the other. Refraction is the name for this phenomenon.
The following are some examples of rectilinear light propagation: Sun Rays enter a room in a straight line.
Light is always projected in a straight line by the torch.
Light is always projected in a straight line by the projector.
Car headlights emit light in a straight path at all times.
Hence, option 1 is the correct answer.

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