Assume that the angle of deviation of a prism is decreasing after each experiment done on dispersion of light. This could be due to ...
1. The density of prism is altered.
2. Wavelength of light ray is altered.
3. Light is emitted from an altered distance. Being infinite from finite distance.
4. The medium surrounding the prism is more denser.
5. The medium surrounding the prism has been heated.
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