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 +(10.8 xx 10^(-14))/(lambda^(2)) and n_(2)=1.45 +(1.8 xx 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.

Answer

600