explain refraction through glass slab
Answers
In this case refraction of light takes place two times. One when it enters the glass slab from air and second time when it enters the air through glass slab.
When light rays travelling through air enters glass slab, they get refracted and bend towards the normal. Now the direction of refracted ray changes again when it comes out of the glass slab into air. Since the ray of light I know travelling from denser medium to rarer medium, it bends away from the normal.
In this case incident ray and the emergent ray are parallel to each other. The perpendicular distance between the original path of incident ray and the emergent ray coming out of the glass slab is called lateral displacement of the emergent ray of light and the angle which the emergent ray makes with the normal is called the angle of emergence.
Answer:
when a ray of light is passing from air to glass that is from rarer medium to denser medium. the refractive bends toward the normal drawn at the point of incidence. in this case i>r. but when the ray of light is passing from glass to air that is from denser medium to rarer medium the refracted ray bends toward normal. in this r>i
the emergent ray O1E which is refractive ray emerging out of the glass slab is parallel to the incident ray. this means the refractived ray has been displaced from its original path. this displacement is known as lateral displacement