A ray of light having intensity `0.5 (W)/(m^2)` is incident perpendicular to the glass slab having refractive index 1.5. What will be intensity of partially refracted ray ?

Options

A. `0.04(W)/(m^2)`
B. `0.02(W)/(m^2)`
C. `2(W)/(m^2)`
D. `4(W)/(m^2)`

Answer

B

Explanation

Intensity of reflected ray,
`I_r=I_0((n_2-n_1)^2)/((n_2+n_1)^2)`
`=0.5((1.5-1.0)^2)/(1.5+1.0)^2`
`=0.5xx(0.25)/(6.25)`
`therefore I_r=0.02(W)/(m^2)`