Uses o concave lens of class 10
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1). used to correct distance vision
2). used to terrestrial telescope
3). used in flashlights
many other uses etc....
hope it's useful for you ......
1) It is used in treat myopia
2)used in flash lights
3)used in telescope to give a sharp image
4)used in binocolours
5)used in vehicle head lights
6)used in glasses
7)used in pepholes
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