Name and define the phenomena where light acts as a ray

1.	Name and define the phenomena where light acts as a ray
Answer» Diffraction is a phenomenon in which light bends at sharp ends of an obstacle or a hole. ... (c) Polarisation of light is a property owing to which a light ray after emerging through a crystal .A special kind like tourmaline) have vibrations in a plane perpendicular to its direction of propagation.

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