Explain the refraction of light through a glass slab with a neat day diagram
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refraction in a glass slab occurs at two stage one at air- glass interface and the second at glass air interface.
when the light ray is incident on a glass slab it travels from a rarer to a denser medium so the refracted ray bend towards the normal(angle i> angle r)
and in the second stage the refracted ray passes from glass to air that is from a denser to a rarer medium so the refracted ray moves away from the normal.(angle i<angle r) in this condition the refracted angle is called the angle of emergence
in this angle of incidence is equal to angle of emergence
no refraction occurs when the light ray passes through the normal
when the light ray is incident on a glass slab it travels from a rarer to a denser medium so the refracted ray bend towards the normal(angle i> angle r)
and in the second stage the refracted ray passes from glass to air that is from a denser to a rarer medium so the refracted ray moves away from the normal.(angle i<angle r) in this condition the refracted angle is called the angle of emergence
in this angle of incidence is equal to angle of emergence
no refraction occurs when the light ray passes through the normal
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