Answers

2014-10-06T18:08:24+05:30
There are many types of lens.they are 1.convex lens 2.concave lens 3.plano convex 4.plano concave lens 5.concave convex lens
they differ in shap,propertys,
properties like convergens or divergens , image real or vertual , magnified or dimanished(of image)
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2014-10-06T18:23:56+05:30
Because all the lenses are not same.there are many types of lenses concave,convex,plano concave,plano convex etc.
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