What is focal length of a lens?
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Focal lenth of a lens
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The focal lenth is the distance between the center of a convex lens and the focal point of the lens.
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The focal lenth is the distance between the center of a convex lens and the focal point of the lens.
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tinapatinsome:
Thank you!!
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good explanation reveur
Thanks,It means a lot:)
Could you please answer my other question as well?
Answered by
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lens have two focus :-
(1) first focus :- object point on principal axis for which image formed at infinity .
second focus :- image point on principal axis for which object is at infinity.
but according to main defnation of focus is the point on principal axis for which image e formed at infinity or appear to form at infinity.
so, according to this first focus is main focus of lens .
for concave this will be negative and convex lens this will be positive
(1) first focus :- object point on principal axis for which image formed at infinity .
second focus :- image point on principal axis for which object is at infinity.
but according to main defnation of focus is the point on principal axis for which image e formed at infinity or appear to form at infinity.
so, according to this first focus is main focus of lens .
for concave this will be negative and convex lens this will be positive
Thank you!!
but I needed focal length not focus :)
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