What is Rayleigh criterion? Explain it for a telescope.
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ᴅɪғғʀᴀᴄᴛɪᴏɴ ʟɪᴍɪᴛs ʀᴇsᴏʟᴜᴛɪᴏɴ. ғᴏʀ ᴀ ᴄɪʀᴄᴜʟᴀʀ ᴀᴘᴇʀᴛᴜʀᴇ, ʟᴇɴs, ᴏʀ ᴍɪʀʀᴏʀ, ᴛʜᴇ ʀᴀʏʟᴇɪɢʜ ᴄʀɪᴛᴇʀɪᴏɴ sᴛᴀᴛᴇs ᴛʜᴀᴛ ᴛᴡᴏ ɪᴍᴀɢᴇs ᴀʀᴇ ᴊᴜsᴛ ʀᴇsᴏʟᴠᴀʙʟᴇ ᴡʜᴇɴ ᴛʜᴇ ᴄᴇɴᴛᴇʀ ᴏғ ᴛʜᴇ ᴅɪғғʀᴀᴄᴛɪᴏɴ ᴘᴀᴛᴛᴇʀɴ ᴏғ ᴏɴᴇ ɪs ᴅɪʀᴇᴄᴛʟʏ ᴏᴠᴇʀ ᴛʜᴇ ғɪʀsᴛ ᴍɪɴɪᴍᴜᴍ ᴏғ ᴛʜᴇ ᴅɪғғʀᴀᴄᴛɪᴏɴ ᴘᴀᴛᴛᴇʀɴ ᴏғ ᴛʜᴇ ᴏᴛʜᴇʀ.
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Diffraction limits resolution. For a circular aperture, lens, or mirror, the Rayleigh criterion states that two images are just resolvable when the center of the diffraction pattern of one is directly over the first minimum of the diffraction pattern of the other.
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