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ʟɪɢʜᴛ ᴇɴᴛᴇʀs ғʀᴏᴍ ᴀɪʀ ᴛᴏ ɢʟᴀss ʜᴀᴠɪɴɢ ʀᴇғʀᴀᴄᴛɪᴠᴇ ɪɴᴅᴇx 1.5. ᴡʜᴀᴛ ɪs ᴛʜᴇ sᴘᴇᴇᴅ ᴏғ ᴛʜᴇ ʟɪɢʜᴛ ɪɴ ᴛʜᴇ ɢʟᴀss? (sᴘᴇᴇᴅ ᴏғ ʟɪɢʜᴛ ɪɴ ᴠᴀᴄᴜᴜᴍ ɪs 3× 10^8 ᴍs -1 )
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Well done is better than well said.......
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