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Q.
Which of the following is true for rays coming from infinity?
JIPMERJIPMER 2011Ray Optics and Optical Instruments
Solution:
Since, lens is made of two layers of different refractive indices, for a given wavelength of light it will have two focal lengths or will form two images at two different points as there are $\mu$ 's as
$\frac{1}{f} \propto(\mu-1)$
