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  4. The given figure shows three cases of a ray passing through a prism of refracting edge A. The case corresponding to minimum deviation is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/77a3cb5e0a2b4aead47bd72d63de0972-.png />

Q. The given figure shows three cases of a ray passing through a prism of refracting edge . The case corresponding to minimum deviation is
image

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Solution:

When deviation is minimum, refracted ray inside the prism is parallel to base of prism. Therefore, (2) is correct.