Question
Light comprising three wavelength $310$, $455$, $620$ $nm$ is incident on a surface separating two media at an angle of $45^o $ and given refractive index for $455$ $nm$ light is $\sqrt 2 $ . If a metal plate of work function $1.2$ $eV$ is placed in this medium then maximum kinetic energy of the electron emitted from metallic plate is.......$eV$
