I believe the answer is B, a real and inverted image is formed on the side of the lens opposite the rubber ducky. The focal length is 15 cm and therefore the center of curvature (2F) will be 30 cm. When the object is placed between F and 2F (in this case 20 cm) in front of a convex lens, an inverted, real image is formed on the other side of the lens.
D, releases a massive amount of energy as heat Hope this helps
It is a concave lens
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(D) reacts with acids by producing gas bubbles
Or
(A) White Color
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