Questions
If a glass prism is dipped in water, its dispersive power
a
increases
b
decreases
c
does not change
d
may increase or decrease depending on whether the angle of the prism is less than or greater then 60o
detailed solution
Correct option is A
Dispersive power of a prism ω=μV−μRμy−1 (when prism is in air)When outside medium is changed to water, new dispersive power is given by ωnew=μVμw−μRμwμyμw−1 = μV − μRμy − μw Hence dispersive power increases when prism is dipped in water.Talk to our academic expert!
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