A thin prism of angle made of glass of refractive index = 1.5 is combined with another prism of glass of refractive index = 1.75. The combination of the prism produces dispersion without deviation. The angle of the second prism should be
As we learnt in
Deviation from thin prism -
- wherein
Applicable when A is very small
( i.e. thin prism )
Net deviation = 0
Option 1)
Incorrect
Option 2)
Correct
Option 3)
Incorrect
Option 4)
Incorrect