A light pen is an output devices
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ɪɴᴘᴜᴛ ʙʀᴏ
ᴀ ʟɪɢʜᴛ ᴘᴇɴ ɪs ᴀ ᴄᴏᴍᴘᴜᴛᴇʀ ɪɴᴘᴜᴛ ᴅᴇᴠɪᴄᴇ ɪɴ ᴛʜᴇ ғᴏʀᴍ ᴏғ ᴀ ʟɪɢʜᴛ-sᴇɴsɪᴛɪᴠᴇ ᴡᴀɴᴅ ᴜsᴇᴅ ɪɴ ᴄᴏɴᴊᴜɴᴄᴛɪᴏɴ ᴡɪᴛʜ ᴀ ᴄᴏᴍᴘᴜᴛᴇʀ's ᴄᴀᴛʜᴏᴅᴇ-ʀᴀʏ ᴛᴜʙᴇ (ᴄʀᴛ) ᴅɪsᴘʟᴀʏ. ɪᴛ ᴀʟʟᴏᴡs ᴛʜᴇ ᴜsᴇʀ ᴛᴏ ᴘᴏɪɴᴛ ᴛᴏ ᴅɪsᴘʟᴀʏᴇᴅ ᴏʙᴊᴇᴄᴛs ᴏʀ ᴅʀᴀᴡ ᴏɴ ᴛʜᴇ sᴄʀᴇᴇɴ ɪɴ ᴀ sɪᴍɪʟᴀʀ ᴡᴀʏ ᴛᴏ ᴀ ᴛᴏᴜᴄʜsᴄʀᴇᴇɴ ʙᴜᴛ ᴡɪᴛʜ ɢʀᴇᴀᴛᴇʀ ᴘᴏsɪᴛɪᴏɴᴀʟ ᴀᴄᴄᴜʀᴀᴄʏ.
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