Optics (Science)
Points to Remember
· Light is a form of energy which travels along a straight line
· The deviation in the path of light ray is called refraction.
· The ratio of speed of light in vacuum to the speed of light in a medium is defined as refractive index ‘µ’ of that medium.
· Lens formula
· Magnification (m) = h' /h =  ν /u
· Power of lens. P = 1/f
· The ability of the eye to focus nearby as well as the distant objects is called power of accommodation of the eye.
· A microscope is an optical instrument which helps us to see the objects which are very small in dimension.
· Telescope is an optical instrument used to see the distant objects clearly.
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