Here ,
f = -20 cm
for the virtual object , u = 30 cm
Using lens formula
1/v - 1/u = 1/f
1/v - 1/30 = -1/20
v = -60 cm
the image distance is -60 cm
Consider a diverging lens of focal length f--20 cm and a virtual object placed 30 cm from the len...
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