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1. An object is placed at a distance of 20 cm from a convex lens of focal length 10 cm. Find the image distance and nature of the image.
 
u =   cm
 
f =  cm
 
The lens formula is
 
Apply the known values in the formula,
 
Thus, the image distance v is  cm
 
2. An object of height 3 cm is placed at 10 cm from a concave lens of focal length 15 cm. Find the size of the image.
 
u =   cm
 
h =   cm
 
f =  cm
 
Apply the known values in the lens formula,
 
Thus, the image distance v is   cm