Question

Straight line motion of light is called
what? in short form​

Answer 1

αɳรωεɾ:-

✨Rᴇᴄᴛɪʟɪɴᴇᴀʀ ᴘʀᴏᴘᴀɢᴀᴛɪᴏɴ ᴅᴇsᴄʀɪʙᴇs ᴛʜᴇ ᴛᴇɴᴅᴇɴᴄʏ ᴏғ Eʟᴇᴄᴛʀᴏᴍᴀɢɴᴇᴛɪᴄ ᴡᴀᴠᴇs (ʟɪɢʜᴛ) ᴛᴏ ᴛʀᴀᴠᴇʟ ɪɴ ᴀ sᴛʀᴀɪɢʜᴛ ʟɪɴᴇ.✨

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Answer 2

Rectilinear propagation describes the tendency of Electromagnetic waves (light) to travel in a straight line. Light only deviates from a straight line when the medium it is traveling through changes density. This is called Refraction.