What is the focal length of a convex lens of focal length 30cm in contact qith a comcave lens of focal lenth 20cm?
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focal length become 20
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Answer:
ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ = 20
➡ ᴛʜᴇ ᴅɪsᴛᴀɴᴄᴇ ᴏғ ғᴏᴄᴜs ғʀᴏᴍ ᴛʜᴇ ᴏᴘᴛɪᴄᴀʟ ᴄᴇɴᴛʀᴇ ᴏғ ᴀ ʟᴇɴs, ɪs ᴄᴀʟʟᴇᴅ ɪᴛ's ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ.
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