The thin lens | Additional Documents & Tests for IIT JAM PDF Download

In a thin lens such as a spectacle, the two principal planes coincide within the lens, and then the conjugate distances p and p′ in the formula above become the distances of object and image from the lens itself.

The focal length of a thin lens can be computed by applying the surface-conjugate formula (6) to the two surfaces in succession, writing the l of the first surface as infinity and the l of the second surface equal to the l′ of the first surface. When this is done, the lens power (P) becomes

The thin lens | Additional Documents & Tests for IIT JAM (6)

The thin lens | Additional Documents & Tests for IIT JAM

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