MCAT Physics Question 108: Answer and Explanation
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Question: 108
3. An object is placed at the center of curvature of a concave mirror. Which of the following is true about the image?
- A. It is real and inverted.
- B. It is virtual and inverted.
- C. It is virtual and upright.
- D. It is real and upright.
Correct Answer: A
Explanation:
One could solve this question with a ray diagram, but be wary about using ray diagrams on Test Day. It is easy to make small mistakes that cause the light rays not to intersect. Therefore, solve the question using the sign convention. If the object is at the center of curvature, its distance is 2f. We can plug into the optics equation:
Because i is positive, the image is real. For single mirrors or lenses, all real images are inverted.