if an object is placed at a distance of 50 cm from a concave lens of focal length 20 cm find the position nature and height of the image
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object distance u=-50cm, focal length of concave lens f=-20cm.
Lens formula:
1/v-1/u =1/f 1/v=1/f+1/u
1/(-20)+1/(-50)=-7/100
v=-100/ 7=-1.43cm
m=v/u=-1.43/(-50)=0.286
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