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A concave mirror has a focal length of $f = -20 \text{ cm}$. If an object is placed at a distance of $u = -30 \text{ cm}$ from the mirror, what is the image distance $v$?
- A.$v = -60 \text{ cm}$
- B.$v = 60 \text{ cm}$
- C.$v = -12 \text{ cm}$
- D.$v = 12 \text{ cm}$
Show correct answer & step-by-step solution
Correct answer: A — $v = -60 \text{ cm}$
Solution
Using the mirror formula , we substitute the values . Solving for gives , indicating a real image formed in front of the mirror.
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