A parallel beam of white light falls on a convex lens. Images of blue, yellow and red light are formed on other side of the lens at a distance of 0.20 m, 0.205 m and 0.214 m respectively. The dispersive power of the material of the lens will be
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a
6191000
b
9200
c
14205
d
5214
answer is C.
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Detailed Solution
For a lens fr−fr=ωfy ⇒ω=fr−frfy=0.214−0.2000.205=14205
A parallel beam of white light falls on a convex lens. Images of blue, yellow and red light are formed on other side of the lens at a distance of 0.20 m, 0.205 m and 0.214 m respectively. The dispersive power of the material of the lens will be