A prism of refractive index `mu_1` and another prism of refractive index `mu_2` are struck together without a gap as shown in Fig.3.17.
.
The ngles of the prisms are shown .`mu_1` and `mu_2` depend on `delta`,the wavelength of light according to
`mu_1=1.20 +(10.8 xx 10^4)/(delta^2)` and `mu_2 = 1.45 + (1.8 xx 10^4)/(delta^2)`,
where `delta` is in nm.
Calculate the wavelength `delta_0` for which rays incident at any angle on the interface BC pass through without bending at that interrface.