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a
Thick lenses and for marginal rays
b
Thick lenses and paraxial rays which subtend very small angles with the principles axis.
c
Thin lenses and paraxial rays which subtend very small angles with the principal axis.
d
Thin lenses and for marginal rays.
answer is C.
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Detailed Solution
in the assumption of lens makers formula it is valid for thin lens only as pole is taken as optical center and incident angle is small i.e, paraxial rays are only assumed.