what is the focal length of a lens if it has power P=4D?
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Answer:
ᴛʜᴇ ꜰᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏꜰ ᴛʜᴇ ʟᴇɴꜱ ɪꜱ 25 ᴄᴍ. ᴡᴇ ᴋɴᴏᴡ ᴛʜᴀᴛ, ᴛʜᴇ ᴩᴏᴡᴇʀ ᴏꜰ ᴛʜᴇʟᴇɴꜱ ɪꜱ ʀᴇᴄɪᴩʀᴏᴄᴀʟ ᴏꜰ ᴛʜᴇ ꜰᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏꜰ ᴛʜᴇ ʟᴇɴꜱ.
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Answer:1/4
Explanation:
1/focal length=power
1/4
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