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A student traces the path of a ray of light passing through a rectangular glass slab and marks the angle of incidence i, angle of refraction r and angle of

emergence e, as shown. The correctly marked angle(s) is/are (A) ∠i only (B) ∠e only (C) ∠r only (D) ∠i and ∠e


Answer would be D as angle I and e can be marked outside the slab whereas angle r needs to be marked inside the glass slab.
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