1.

The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let D 1, and D 2, be angles of minimum deviations for red and blue light respectively in a prism of this glass. Then,

Answer»

`D_1gt D_2`
`D_1lt D_2`
`D_1=D_2`
can be less than or greater than `D_2`, depending UPON the angle of prism.

Solution :MINIMUM DEVIATION angle D=`(mu-1)A`
`thereforeD prop mu`
and `mu_("violet") GT mu_("red")`
`therefore D_2 gt D_1` HENCE, `D_1 lt D_2`


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