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A parallel beam of white light falls on ...

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 `0.20m, 0.205m` and `0.214m` respectively. The dispersive power of the material of the lens will be

A

`629/1000`

B

`9/200`

C

`14/208`

D

`5/214`

Text Solution

Verified by Experts

The correct Answer is:
C
`w=((f_(R) -f_(v))f_(y))/(f_(v)f_(R))`
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