1.

A thin prism of angle 6^(@) made of glas of recfractive index 1.5 is combined with another prism made of glas of mu=175 to produce dispersion without deviation. The angel of second prism is

Answer»

`7^(@)`
`4.67^(2)`
`9^(@)`
`5^(@)`

SOLUTION :(b) `delta=0`
`:. delta_(1)-delta_(2)=0`
or `(mu_(1)-1)A_(1)-(mu_(2)-1)A_(2)=0`
or `(1.5-1)7^(@)=(1.75-1)A_(2)`
or `7/2=3/4A_(2)`
`:. A_(2)=7/2xx4/3`
`=14/3=4.67^(@)`


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