a glass slab of thickness 12mm is placed on table.The lower surface of the slab has a black spot. At what depth from the upper surface will the spot appear when viewed from above

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Q. A glass slab of thickness

12

mm is placed on a table. The lower surface of the slab has a black spot. At what depth in (mm) from upper surface will the spot appear, when viewed from above

(μ = 1.5)

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