1 (a) A concave lens of focal length 20 cm form an image 10 cm away from the lens. Use lens formula to find the position of the object with respect to the lens. Also draw the ray diagram to illustrate the image formed in this case.
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1/v-1/u=1/f
1/-10-1/u=1/-20
-1/u=1/-20+1/10
-1/u=-1+2/20
-1/u= 1/20
u=-20cm
1/-10-1/u=1/-20
-1/u=1/-20+1/10
-1/u=-1+2/20
-1/u= 1/20
u=-20cm
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