a) What is astigmatism, which type of
problem a person feels during this defect
which lens i need to correct it?
b)what do you mean by deviation,
c) What is lateral diplacement on what factors it depends.
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Explanation:
a. Astigmatism is an eye disease which gives a linear image of a point source of light on your retina.
It can be corrected by cylindrical lens.
b. Deviation means changing the direction of light ray from the direction I was travelling.
c. Lateral displacement means shifting the path of light ray parallely to another path.
It can be seen in case when light Ray is travelling through a glass slab
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