Light wave when it goes from something less density material to more density material it bends away from normal.
A solid substance's density is defined as its mass in relation to its volume. Density is defined by the equation d = M/V, where M and V stand for mass and volume, respectively. Grams per cubic centimeter is the unit of measurement for density. For instance, compared to Earth's density of 5.51 grams per cubic centimeter, water has a density of 1 grams. Another method to measure density is kilograms per cubic meter (in meter-kilogram-second or SI units)
It is straightforward to compute the relationship between mass and volume when you know the density. For instance, the formula for determining a body's mass is M = Vd, whereas the formula for determining a body's volume is V = M/d.
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