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Because both incident ray and emergent ray have same slope.
The emergent ray is the ray of light which passes through a denser medium(glass) to a rarer medium(air).
The incident ray is the ray of light that first strikes the surface of a medium or interface, while the emergent ray is the ray of light that exits the medium after being refracted or reflected. The direction of the emergent ray depends on the angle of incidence and the properties of the medium.
Angle of emergence is the angle which the normal makes with the emergent ray.
The Incident ray, falling on the glass slab, and the Emergent ray will always be parallel to each other.
No, the incident ray and emergent ray will not be parallel if the glass slabs have different refractive indices. This is because the light rays will experience refraction at each interface as they pass through the slabs due to the change in refractive index, causing the emergent ray to be offset from the incident ray.
As the angle of incidence increases, the intensity of the emergent ray would decrease. At a certain critical angle of incidence, the emergent ray would not be able to transmit through the interface, causing total internal reflection.
The lateral displacement of an emergent ray depends on the angle of incidence of the ray at the surface of the medium and the refractive index of the two media it is traveling through.
The angle Between the path of incident ray and emergent ray
This is because the amount of refraction taking place at the parallel faces of a glass slab is equal but opposite and since the faces are parallel the emergent ray emerges parallel to the incident ray with lateral displacement.
In a rectangular glass slab, the emergent ray is parallel to the incident ray because of the principle of refraction. When light enters a denser medium (like glass) from a rarer medium (like air), it bends towards the normal. As the light exits the glass slab and reenters air, it bends away from the normal. The combination of these two refractions results in the emergent ray being parallel to the incident ray.
Yes, lateral displacement occurs when a light ray passes through a different medium at an angle. The amount of lateral displacement depends on the refractive indices of the two media and the angle of incidence. The emergent ray is the ray that exits the second medium and its direction is affected by the lateral displacement.