What do we need to see a shadow
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ᴛʜᴇ ᴛʜʀᴇᴇ ᴛʜɪɴɢs ᴛᴏ ғᴏʀᴍ ᴀ sʜᴀᴅᴏᴡ ᴀʀᴇ:
- ɪ)ᴀ sᴏᴜʀᴄᴇ ᴏғ ʟɪɢʜᴛ.
- ɪɪ)ᴀɴ ᴏᴘᴀǫᴜᴇ ᴏʙᴊᴇᴄᴛ ᴛᴏ ʙʟᴏᴄᴋ ᴛʜᴇ ʟɪɢʜᴛ.
- ɪɪɪ)ᴀ sᴜʀғᴀᴄᴇ ʙᴇʜɪɴᴅ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ᴛᴏ ᴍᴀᴋᴇ ᴛʜᴇ ʟɪɢʜᴛ ғᴀʟʟ ᴏɴ ɪᴛ.
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