An object 1cm high produces a real image 1.5cm high, when placed at a distance of 15cm from a concave mirror.calculate : (1) the position of the image (2) focal length of the concave mirror
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height of object (h1):. 1cm
height of image (h2): -1.5cm
object distance (u): -15cm
1. To find the position of the image we need to find v
so,
h2/h1= -v/u
-1.5/1 = -v/-15 (cross multiplication)
-22.5=v
2. To find focal lenght
1/f = 1/v+1/u
1/f= 1/-22.5+1/-15
f= -9
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