24. In the figure, a ray of light approaches normal to the surface on the left. Which best represents the refracted ray which leaves the right surface? A air ►B С glass glass D (A) A (B) B (C) C (D) D
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(C) C represents the refracted ray that leaves from the right surface.
What is refraction?
- When a ray of light passes from different media, it gets refracted depending on the density of the medium.
- When going from rarer medium to denser medium, it bends towards the normal and when going from denser to rarer medium, it bends away from normal.
What is normal?
- Normal is an imaginary line drawn perpendicular to the interface between the mediums.
- An incident ray parallel to the normal, does not bend away or towards the normal. It passes along the next medium without refracting.
From the figure:
- While entering from air medium to glass medium, the ray does not undergo refraction.
- At interface M, the ray enters inside the glass without bending because the ray enters parallel to the normal.
- At interface P, the ray travels from denser to rarer medium and so it bends away from normal.
- At interface Q, the ray travels from rarer to denser medium and so it bends towards normal.
- And therefore, the final refracted ray is along C.
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