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. What is persistence of vision?

What is meant by the accommodation eye? How is it achieved?
What is scattering of light? How is the intensity “I” of scattered light related to wavelength “λ” of incident light?


The continuance of sensation of eye for some time after the removal of the object is called persistence of vision. 

power of  accommodation of eye is the ability to observe distinctly the objects situated at widely different distances from the eye, an account of change in focal length of eye lens by the action of ciliary muscles holding the lens. the max. power of accomodation of the eye for a person having normal vision (d =25cm) is P=100/d = 100/25 = 4 dioptre
the scattering of light involves bouncing off of electromagnetic radiation by atoms/molecules of the medium through which they are travelling.
I = 1/λ
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1. When we see an object, we continue to see it for some time even after the object is removed. This phenomenon is called persistence of vision. It lasts for about one sixteenth of a second.

2. Accommodation of eye is the ability of eye to change its focal length so that we can see both distant and nearby object clearly.
It is achieved by the contraction and and relaxation of the ciliary muscle. When the ciliary muscle contracts, the lens gets stretched and the focal length increases and we can see the distant objects clearly. When the ciliary muscle relaxes, it contracts the lens and the focal length of the lens decreases and we can see nearby objects clearly.

3. Scattering of light is the phenomenon in which the light is scattered by the particles in the medium. 
The intensity "I" is inversely proportional to the 4th power of wavelength or
I\ \alpha\  \frac{1}{\lambda ^4}

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