How far should an object be from the pole of the concave mirror of focal lenth 20 cm to from a real image whose size is 1/5 of the side of the object
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Magnification (m) = -1/5 (both image and obj. are real)
Focal length (f) = -20 cm
We know , m = -f/(u-f)
-1/5 = -(-20)/(u+20)
u=-120cm
Hence , the object should be kept at a distance of 120cm in front of the mirror.
Focal length (f) = -20 cm
We know , m = -f/(u-f)
-1/5 = -(-20)/(u+20)
u=-120cm
Hence , the object should be kept at a distance of 120cm in front of the mirror.
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