plz answer this (b) question for more points
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b) Focal length of the lens, F = 1/ Power of the lens ⇒ F = 1/P ⇒ F = 1/5 ⇒ F = 0.2 m ⇒ F = 20 cm
To get the magnified image the concave lens cannot be used as it forms the dimisnished image only. So we can use a convex lens to do so.