A real object is placed at a distance of 30 cm infront of a convex lens of power 5D. Then the position of the image is
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Using the definition of Power of a Lens, we can determine the focal length (f) of the lens. f = 1/5 = 0.2 m = 20 cm.
The lens is a CONVEX lens for TWO reasons: (a) the Power is positive; (b) the image is VIRTUAL & Magnified, which is a property of a convex lens.
Di would be NEGATIVE (2 Do) with the convention that virtual image distances are NEGATIVE.
Using the lens equation: Do = 10 cm.
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