Question

explain refraction of light b through prism​

Answer 1

Refraction is the bending of light when it goes from one medium to another so, when a ray of light passes through a glass prism, refraction of light occurs both, when it enters the prism as well as when it leaves the prism. ... In this case the ray of light is deviated on passing through the prism.

I hope you have understood this.

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Answer 2

ʀᴇғʀᴀᴄᴛɪᴏɴ ɪs ᴛʜᴇ ʙᴇɴᴅɪɴɢ ᴏғ ʟɪɢʜᴛ ᴡʜᴇɴ ɪᴛ ɢᴏᴇs ғʀᴏᴍ ᴏɴᴇ ᴍᴇᴅɪᴜᴍ ᴛᴏ ᴀɴᴏᴛʜᴇʀ sᴏ, ᴡʜᴇɴ ᴀ ʀᴀʏ ᴏғ ʟɪɢʜᴛ ᴘᴀssᴇs ᴛʜʀᴏᴜɢʜ ᴀ ɢʟᴀss ᴘʀɪsᴍ, ʀᴇғʀᴀᴄᴛɪᴏɴ ᴏғ ʟɪɢʜᴛ ᴏᴄᴄᴜʀs ʙᴏᴛʜ, ᴡʜᴇɴ ɪᴛ ᴇɴᴛᴇʀs ᴛʜᴇ ᴘʀɪsᴍ ᴀs ᴡᴇʟʟ ᴀs ᴡʜᴇɴ ɪᴛ ʟᴇᴀᴠᴇs ᴛʜᴇ ᴘʀɪsᴍ. ... ɪɴ ᴛʜɪs ᴄᴀsᴇ ᴛʜᴇ ʀᴀʏ ᴏғ ʟɪɢʜᴛ ɪs ᴅᴇᴠɪᴀᴛᴇᴅ ᴏɴ ᴘᴀssɪɴɢ ᴛʜʀᴏᴜɢʜ ᴛʜᴇ ᴘʀɪsᴍ.