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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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Answer» (c) Longitudinal chromatic aberration = ωf = 0.08 × 20 = 1.6 cm |
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