Question

What is Focal Length ??

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ཧᜰ꙰ꦿ • ITz ➢ᴘᴀʜᴀᴅɪ ʙᴏʏ HeRe • ཧᜰ꙰ꦿ​

Answer 1

focal length is the space bw pole and principal focus

Answer 2

• The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light.