Question

A rubber ducky is placed 20 cm from a thin convex lens with a focal length of 15 cm. Which statement correctly describes the nature and position of the image formed of the rubber ducky? A) Real and upright on the side of the lens opposite the rubber ducky. B) Real and inverted on the side of the lens opposite the rubber ducky. C) Imaginary and upright on the side of the lens opposite the rubber ducky. D) Imaginary and inverted on the same side of the lens as the rubber ducky.

Answer 1

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.

Answer 2

Answer:

B

Explanation: