Why are incident and emergent rays parallel to each other in case of rectangular glass slab?

ICSE 10 - Physics

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ICSE 10 - Physics

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ICSE 10 - Physics

exercise 4b q. 6

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ICSE 10 - Physics

exercise 41 q. 10

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Text Solution

Solution : i. Refraction oflight talces place twice in a glass slab. <br> ii. The first refraction occurs when light enters the glass from air. The second refraction occurs when light enters air from glass. <br> iii. The angle of incident of the light ray is equal to the angle of emergence. <br> iv. On both the parallel sides of the glass slab, the change in direction of light ray is equal but in opposite directions. <br> v. Thus, the light ray emerging from the glass slab is parallel to the incident ray.