q 6 please help me to solve this
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f = 1/P
f = 1/0.5 = 2m = 200cm (concave)
f = 1/1 = 1m = 100cm (convex)
f = 1/0.5 = 2m = 200cm (concave)
f = 1/1 = 1m = 100cm (convex)
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