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Ray Optics and Optical Instruments — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsRay Optics and Optical Instruments2 Marks
Question
Why is there no dispersion in the light refracted through a rectangular glass slab?
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Answer

It can be considered to be equivalent to two prisms in reverse way. In the case of a rectangular glass slab the rays of all colours combine together in the reverse prism. Hence, there is no dispersion.

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