Question 257 of 295

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 $\lambda ,$ the wavelength of light, according to the relation ${n}_{1}=1.2+\dfrac{10.8\times {10}^{-14}}{{\lambda }^{2}}$ and ${n}_{2}=1.45+\dfrac{1.8\times {10}^{-14}}{{\lambda }^{2}}$
The wavelength for which rays incident at any angle on the interface $BC$ pass through without bending at that interface will be ____ $nm.$