Question

what is light?what is rectilinear propagation of light?​

Answer 1

Light or is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye.

The Rectilinear Propagation of Light describes that Light travels in a Straight Line.

Hope it helps

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Answer 2

ᴛʜᴇ ɴᴀᴛᴜʀᴀʟ ᴀɢᴇɴᴛ ᴛʜᴀᴛ ꜱᴛɪᴍᴜʟᴀᴛᴇꜱ ꜱɪɢʜᴛ ᴀɴᴅ ᴍᴀᴋᴇꜱ ᴛʜɪɴɢꜱ ᴠɪꜱɪʙʟᴇ.

Rectilinear propagation describes the tendency of Electromagnetic waves (light) to travel in a straight line.

ʜᴏᴩᴇ ᴛʜɪꜱ ʜᴇʟᴩᴇᴅ yᴏᴜ