Question

Define critical angle​

Answer 1

Answer:

Critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees. Make particular note that the critical angle is an angle of incidence value. For the water-air boundary, the critical angle is 48.6-degrees.

Answer 2

Critical angle

➡️Tʜᴇ ᴄʀɪᴛɪᴄᴀʟ ᴀɴɢʟᴇ ɪs ᴅᴇғɪɴᴇᴅ ᴀs ᴛʜᴇ ᴀɴɢʟᴇ ᴏғ ɪɴᴄɪᴅᴇɴᴄᴇ ᴛʜᴀᴛ ᴘʀᴏᴠɪᴅᴇs ᴀɴ ᴀɴɢʟᴇ ᴏғ ʀᴇғʀᴀᴄᴛɪᴏɴ ᴏғ 90-ᴅᴇɢʀᴇᴇs.

➡️Mᴀᴋᴇ ᴘᴀʀᴛɪᴄᴜʟᴀʀ ɴᴏᴛᴇ ᴛʜᴀᴛ ᴛʜᴇ ᴄʀɪᴛɪᴄᴀʟ ᴀɴɢʟᴇ ɪs ᴀɴ ᴀɴɢʟᴇ ᴏғ ɪɴᴄɪᴅᴇɴᴄᴇ ᴠᴀʟᴜᴇ. Fᴏʀ ᴛʜᴇ ᴡᴀᴛᴇʀ-ᴀɪʀ ʙᴏᴜɴᴅᴀʀʏ, ᴛʜᴇ ᴄʀɪᴛɪᴄᴀʟ ᴀɴɢʟᴇ ɪs 48.6-ᴅᴇɢʀᴇᴇs.

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