Why is the surface curved in torch light?
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The surface is curved in torch light so that the rays coming from the bulb can be focussed at one point and we can see better
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the curved surface is convexo concave lens. it helps the light to spread in larger area and more area is visible for us.
https://goo.gl/images/CKYAu5
https://goo.gl/images/CKYAu5
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