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power 4dAnswer:the power of a convex lens is always positive. as you can see here the power is +4D, therefore the nature of the lens is that it is a convex lens. we know, P = 1f. alsoPower4D merupakan web betting permainan slot on terbaik dengan pilihan provider terpercaya top asia. Kami menjamin anda tidak mudah bosan dan akan terus ketagihan untuk