A concave mirror of focal length 20cm is to be as shaving mirror.Which of the following is a situable object distance from the mirror. a)10cm b) 20cm c)30cm.
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30cm is suitable object distance from the mirror
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Answer: it should be 10 cm
Explanation:
If the mirror has a focal length of 20 cm then it's focus will be 20 cm away from it so if the object is kept b if the object is kept between focus and pole then the image we get will be magnified so if the object is kept 10 cm which lies between the focus and the pole that will be suitable for a shaving mirror
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