Q16 of 29 Page 109

Explain the refraction of light through a glass slab with a neat ray diagram. (AS5)

Consider the rectangular slab as shown in figure.



AE = incident ray;


I = Angle if incidence;


R = Angle of refraction;


• On entering the glass slab the light ray bends towards the normal and travels along EF.


• The refracted ray EF is incident on the face SR at angle of incidence r’.


• The emergent ray FD bends away from normal at angle of refraction e.


• The emergent ray FD is parallel to the incident ray AE but it has been laterally displaced with respect to incident ray.


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Take a thin thermal sheet. Cut it in circular discs of different radii like 2cm, 3cm, 4cm, 4.5cm. 5cm etc ad mark centers with sketch pen. Now take needles of length nearly firm. Pin a needle to each disc at its centre vertically. Take water in a large opaque tray and place the disc with 2cm radius in such a way that the raw& is inside the water ac shown in fig Q15. Now try to view the free end (head) of the needle from surface of the water.


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