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When a light ray emerges out after refra...

When a light ray emerges out after refraction at a rectangular glass slab, it is parallel to the incident ray. Why ?

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The bending of light ray at the air - glass interface is equal to the bending of the light ray at the glass - air interface. The incident ray is thus parallel to the emergent ray.
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ZEN PUBLICATION-LIGHT - REFLECTION AND REFRACTION-ZEN ADDITIONAL QUESTIONS SECTION (VERY SHORT ANSWER TYPE QUESTIONS) VSA
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  10. A light ray travelling from medium 1 to medium 2, does not suffer refr...

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  11. What do you understand from the term 'Refractive index' of a medium or...

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  12. Lens X has focal length 20 cm and lens Y has focal length 40 cm. Which...

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  14. A convex lens has a focal length 15 cm. A student obtains a clear shar...

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  15. Can we find the focal length of a concave lens using the distant objec...

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  16. A concave mirror is dipped in vessel containing kerosene. Will this af...

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  17. What is the kind of mirror used by an ENT specialist to examine the ea...

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  18. A convex lens is immersed in a container of water. Will this cause a c...

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  19. When a light ray emerges out after refraction at a rectangular glass s...

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  20. Define the following terms in the context of spherical mirrors : (...

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