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Perimeter

A glass cube ...

Question

A glass cube of side length 'a' and p = 1.5 is placed on a surface. A small light bulb is at the centre of base of cube. What minimum area of side wall of the cube should be painted so that no light comes out of the side walls of the cube? (Consider only single reflection or refraction)

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Q. A cube is painted on all sides Three adjacent sides are painted red Two of the remaining sides are painted green and one is painted yellow The cube is then cut into eight small cubes How many cubes have no side painted red?

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4 c m

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Total no. of cubes obtained

= \frac{4 \times 4 \times 4}{1 \times 1 \times 1} = 64

n = \frac{side of big cube}{side of small cube} = \frac{4}{1} = 4

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