Lens Formula
Lens Formula
If we place an object at a distance u from the optical centre 'O' and its image is formed at a distance v then
This relationship is known as lens formula. Here f is the focal length of this lens.
Proof:
Consider an object AB placed beyond 2F in front of a convex lens. On the other side of lens an image is formed between F and 2F which is real, inverted and smaller in size. Applying the sign conventions :
Object distance (OB ):= -u
Image distance(OB') := v
Focal length(OF): = +f
In and
=
( vertically opposite angle)
=
( each
)
(By AA similarity)
The focal length is positive for _______________ . | |||
| Right Option : B | |||
| View Explanation | |||
In the lens f' stands for ._____________. | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct ? (a) The lens formula u stands for object distance . (b) The lens formula v stands for image distance . (c) The lens formula f stands for focal length. | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [20]
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