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in fig A is emergent ray
in fig 2 R is called refracted ray
fig 3 R iss refracted ray
explanation
**when a ray of light passes through glass slab
it is laterally displaces downward from a actual point
**when a ray of light goes rarer to denser it bends
towards the normal
**when ray of light goes denser to rarer it bends away from the normal
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