Today is the death anniversary of Christian Huygens,Dutch Physicist and Astronomer (1629-1695). Huygens is best known for his contributions to the fields of optics and Dynamics. To Huygens, light was a type of vibratory motion, spreading out and producing the sensation of light when impinging on the eye. On the basis of this theory, he deduced the laws of reflection and refraction and explained the phenomenon of double refraction. Some of the key contributions of Christiaan Huygens to physics :