WHAT IS LIGHT?
• Light is a form of energy to which human eye is sensitive.
प्रकाश ऊर्जा का एक रूप है जिसके प्रति मानव आँख संवेदनशील होती है।
• The whole electromagnetic spectrum ranges from cosmic rays on shorter wave length to radio waves on longer wavelength.
• Ultraviolet rays, infrared rays and visible rays are clinically significant from ophthalmic point of view.
• Visible white light consists of seven colors ranging from violet (400 nanometer) to red (700 nanometer).
• Light with longer wavelength has lesser energy and light with shorter wavelength has more energy.
• Optics is a branch of physics which deals with properties of light including its interaction with matter and construction of instruments that use or detect it.
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