Question

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
A. `7^(@)`
B. `4.67^(2)`
C. `9^(@)`
D. `5^(@)`

Answer 1

(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^(@)`