(20 12? A beam of monochromatic light obliquely passes through a glass brick with thickness d, and it is known that the refractive index of glass brick to monochromatic light is n, which is monochroma

(20 12? A beam of monochromatic light obliquely passes through a glass brick with thickness d, and it is known that the refractive index of glass brick to monochromatic light is n, which is monochromatic. I. Set the refraction angle r of colored light, according to the refraction law.

n=sinαsinr…( 1)

Solution, r = 30...(2)

Ⅱ. Let the distance of light passing through the glass be s and the time be t, then:

s=dcosr…(3)

The speed of light in glass is v=cn,

Time is t = SV...(4)

From (1), (3) and (4):

t=n2dcn2？ sin2α

A:

Ⅰ. The refraction angle of this colored light after being refracted by the glass brick is 30.

Ii. the relationship between the time required for colored light to pass through the glass brick and the incident angle α and refractive index n is t=n2dcn2? sin2α。