2 cm high object is placed at a distance of 20 cm from a concave mirror. The image is real, inverted and 3 cm in size. Find the focal length of the mirror and the position of the image.
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Answer:
- 19.2 cm
Explanation:
Image is inverted
m = image height / object height
= -3/2 = 1.5 cm
object distance is u=-32 cm
m=-v/u
- 1.5 = v/- 32
Position of object from lens is v = -48 cm
1/f = 1/v + 1/u
1/f = 1/ -48 + 1/ - 32
f = -19.2 cm
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