question: Two lens have focal length+10cm and -15cm in contact for
achromactic combination ratio
of dispersive power will be :-
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Answer:Dispersive power of a lens ∝ 1μ-1 Thus ω1ω2 = μ2-1μ1-1 = 2 Thus μ2 = 2μ1 ... powers in the ratio 2 : 1, behave as an achromatic lens of focal length 10 cm. ... They will have zero longitudinal chromatic aberration if their dispersive powers are in ... focal length ′f ′ from achromatic combination when separated by distance ...
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