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Four students A, B, C and D selected the following items from the materials available in the science laboratory to perform an experiment to study the refraction of light through a glass slab : (A) convex lens, glass slab, pins, drawing board, white paper, scale (B) glass slab, pins, drawing board, scale, white paper, protractor (C) glass slab, glass prism, candle, screen, pins, scale, drawing board, protractor (D) concave mirror, pins, glass slab, protractor, white paper, drawing board Correct choice of the items required is made by the student :