The dispersive power of material of a lens of focal length 20 cm is 0.08.
The dispersive power of material of a lens of focal length 20 cm is 0.08. What is the longitudinal chromatic aberration of the lens ?
(a) 0.08 cm (b) 0.08/20 cm (c) 1.6 cm (d) 0.16 cm
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