the image of an object formed by a mirror is real and inverted and is of magnification -1 if a image is at a distance of 40cm from the mirror where is object placed and also find the focal length of the mirror where would be the image if moved 20cm towards the mirror
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P=1/f
-1=1/f
f=-1
-1is the focal length
-1=1/f
f=-1
-1is the focal length
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