1.

What is the focal length of a lens if it has power P=4D?​

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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