Thin Lens Formula

Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics:

Thin Lens Formula:

It is a relation between focal length of a lens and distance of object and image from optical centre of the lens.

Let O be the optical centre and f be the principal focus of a convex lens of focal length OF= f, 

Distance of object OB= u

Distance of image OB’= v


Thin Lens Formula


Note: This formula can also be approved for concave lens and for virtual image in the same way.

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