Question Detail
Question
Where is the image formed by a concave mirror with radius 20 cm if the object is placed 20 cm from the mirror?
Correct Answer
Option B is the correct answer.
Detailed Explanation
The focal length f = R/2 = 10 cm. The object is placed at 20 cm, which is 2f (the center of curvature). For a concave mirror, when the object is at the center of curvature, the image is formed at the same point (the center of curvature).
Hint
For a concave mirror, when the object is at 2f (center of curvature), the image is also at 2f.