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# With the help of a diagram show double concave and double convex lens and how will you identify both of them by touch

Asked by mkmishra101 29th December 2016, 7:03 AM
"A double concave lens is the one which has two concave surfaces. Now concave surfaces are the ones which are curved inwards. So, a double concave lens will have two inward curved surfaces. The following diagram shows the double concave lens. (Provide the concave lens image which I have attached)

Similarly, a double convex lens is the one which has two convex surfaces. Now convex surfaces are the ones which are curved outwards. So, a double convex lens will have two outward curved surfaces. The following diagram shows the double convex lens. (Provide convex lens image)

Identifying by touch: When you touch the lens and you feel that the surface that you are touching is bulging or curving outwards then that lens will be a double convex lens. If you are touching the surface and you feel that there is a dent or a curve which is inwards then the lens is a concave lens.

Answered by Expert 31st December 2016, 2:22 PM
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