C. Tick () the correct option. 1. Which of the following conditions is not necessary for a change in the direction of propagation when a light ray goes from one medium to another? The light ray must be incident at an angle greater than 0° with respect to the normal at its point of incidence. The two media must both be transparent. The two media must have different refractive indices. The incident light rays must always have only the blue colour.
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The light ray must be incident at an angle greater than 0° with respect to the normal at its point of incidence.
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