1. Define the term principal axis of a spherical mirror
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a line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror.
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ᴀ ʟɪɴᴇ ᴘᴀssɪɴɢ ᴛʜʀᴏᴜɢʜ ᴛʜᴇ ᴄᴇɴᴛᴇʀ ᴏғ ᴛʜᴇ sᴜʀғᴀᴄᴇ ᴏғ ᴀ ʟᴇɴs ᴏʀ sᴘʜᴇʀɪᴄᴀʟ ᴍɪʀʀᴏʀ ᴀɴᴅ ᴛʜʀᴏᴜɢʜ ᴛʜᴇ ᴄᴇɴᴛᴇʀs ᴏғ ᴄᴜʀᴠᴀᴛᴜʀᴇ ᴏғ ᴀʟʟ sᴇɢᴍᴇɴᴛs ᴏғ ᴛʜᴇ ʟᴇɴs ᴏʀ ᴍɪʀʀᴏʀ.
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