how does a plain mirror doesn't make a real image ?
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ᴛʜᴇ ɪᴍᴀɢᴇ ꜰᴏʀᴍᴇᴅ ʙy ᴀ ᴩʟᴀɴᴇ ᴍɪʀʀᴏʀ ɪꜱ ᴀʟᴡᴀyꜱ ᴠɪʀᴛᴜᴀʟ (ᴍᴇᴀɴɪɴɢ ᴛʜᴀᴛ ᴛʜᴇ ʟɪɢʜᴛ ʀᴀyꜱ ᴅᴏ ɴᴏᴛ ᴀᴄᴛᴜᴀʟʟy ᴄᴏᴍᴇ ꜰʀᴏᴍ ᴛʜᴇ ɪᴍᴀɢᴇ), ᴜᴩʀɪɢʜᴛ, ᴀɴᴅ ᴏꜰ ᴛʜᴇ ꜱᴀᴍᴇ ꜱʜᴀᴩᴇ ᴀɴᴅ ꜱɪᴢᴇ ᴀꜱ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ɪᴛ ɪꜱ ʀᴇꜰʟᴇᴄᴛɪɴɢ. ... ᴠɪʀᴛᴜᴀʟ ᴏʙᴊᴇᴄᴛꜱ ᴩʀᴏᴅᴜᴄᴇ ʀᴇᴀʟ ɪᴍᴀɢᴇꜱ, ʜᴏᴡᴇᴠᴇʀ. ᴛʜᴇ ꜰᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏꜰ ᴀ ᴩʟᴀɴᴇ ᴍɪʀʀᴏʀ ɪꜱ ɪɴꜰɪɴɪᴛy; ɪᴛꜱ ᴏᴩᴛɪᴄᴀʟ ᴩᴏᴡᴇʀ ɪꜱ ᴢᴇʀᴏ.
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The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. ... Virtual objects produce real images, however. The focal length of a plane mirror is infinity; its optical power is zero.
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