Ans:
- He wrote the book named "Kitb-ul-Maazir", about the branch of Physics called Opticalism.
- He gave the laws of reflection and refraction.
- He explained the luminous, non-luminous transparent and transparent objectives.
- He described the different parts of eyes.
- According to Ibn-ul-Haitham, when light passes through a medium then it takes minimum time to take its path. This is known as Fermate Principle.
- The nature of light is the form of energy according to him.
- He explained the refraction of light.
- He explained the image formed by concave mirror.
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