A prism of refractive index n_1 and another prism of refractive index n_2 are stuck together (as shown in the figure). n_1 and n_2 depend on λ, the…

A prism of refractive index $\displaystyle \mathrm{n}_1$ and another prism of refractive index $\displaystyle \mathrm{n}_2$ are stuck together (as shown in the figure). $\displaystyle \mathrm{n}_1$ and $\displaystyle \mathrm{n}_2$ depend on $\displaystyle \lambda$, the wavelength of light, according to the relation $$\mathrm{n}_1=1.2+\frac{10.8 \times 10^{-14}}{\lambda^2} \text { and } \mathrm{n}_2=1.45+\frac{1.8 \times 10^{-14}}{\lambda^2} $$ The wavelength for which rays incident at any angle on the interface BC pass through without bending at that interface will be \_\_\_\_ nm.