A 10 mm long pin is placed vertically in front of a concave mirror. A 5 mm long image of the pin is formed at 30 cm in front of the mirror. What is the focal length of this mirror ?
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Answer:
focal length is 20 cm
Explanation:
magnification is ratio of image height to object height or image distance to object distance get object distance through this and get focal length as is ratio of product of image and object distance to their sum
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