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A parallel beam of white light falls on convex lens. the other side of the lens at a distance of 20 cm, 20.5 cm and 21.4 cm respectively. The dispersive power of the material of the lens will be :- |
Asked by Atulcaald
29th April 2018,
1:20 AM
Answered by Expert
Answer:
when whilte light is passed through lens, violet colour is subjected to more deviation than red colour.
Hence when the parallel beam of white light falls on a convex lens in the question, violet colour focused at 20 cm. red color is focused at 21.4 cm.
In between green color is focused at 20.5.
from lens-makers formula we can write
f is focal length, μ is refractive index of material of lens, R1 and R2 are radii of curvature. K is constant
hence dispersive power = 20.5× [ (1/20) - (1/21.4) ] = 0.067
Answered by Expert
30th April 2018,
4:00 PM
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