What do mean by coherent source of light ?
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ᴄᴏʜᴇʀᴇɴᴛ sᴏᴜʀᴄᴇs ɪғ ʟɪɢʜᴛ ʙᴇᴀᴍs ғʀᴏᴍ ᴛᴡᴏ ɪɴᴅᴇᴘᴇɴᴅᴇɴᴛ sᴏᴜʀᴄᴇs ʀᴇᴀᴄʜ ᴛʜᴇ sᴀᴍᴇ ᴘᴏɪɴᴛ ɪɴ sᴘᴀᴄᴇ, ᴛʜᴇʀᴇ ɪs ɴᴏ ғɪxᴇᴅ ʀᴇʟᴀᴛɪᴏɴsʜɪᴘ ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ ᴘʜᴀsᴇs ᴏғ ᴛʜᴇ ᴛᴡᴏ ʟɪɢʜᴛ ʙᴇᴀᴍs ᴀɴᴅ ᴛʜᴇʏ ᴡɪʟʟ ɴᴏᴛ ᴄᴏᴍʙɪɴᴇ ᴛᴏ ғᴏʀᴍ ɪɴᴛᴇʀғᴇʀᴇɴᴄᴇ ᴇғғᴇᴄᴛs. sᴜᴄʜ ʟɪɢʜᴛ ᴡᴀᴠᴇs ᴀʀᴇ ᴄᴀʟʟᴇᴅ ɪɴᴄᴏʜᴇʀᴇɴᴛ.
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