A small candle is placed 18 cm from a concave mirror with a focal length of 6 cm. What will be the nature and position of the image formed?
Real, 9 cm in front of the mirror
Using the sign convention for a concave mirror, the object distance u = -18 cm and the focal length f = -6 cm.
The mirror formula is 1/v + 1/u = 1/f.
So, 1/v = 1/f - 1/u = 1/(-6) - 1/(-18) = -3/18 + 1/18 = -2/18 = -1/9.
Therefore v = -9 cm, meaning the image is formed 9 cm in front of the mirror and is real and inverted.
Hence, the correct answer is Real, 9 cm in front of the mirror.
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Important Questions from Refraction and Reflection
- How can you identify a concave and a convex mirror based on the direction of their reflecting surfaces?
- Stars appear to twinkle in the night sky because ______.
What type of image is always formed by a concave lens, no matter where the object is placed?
- Which of the following is NOT caused by atmospheric refraction?
- According to the sign convention, the height of an erect image formed by a mirror is taken as:
