Solve the given problem:
 
An object of height \(3\) \(cm\) is placed at \(20\) \(cm\) from a concave lens of focal length \(20\) \(cm\). 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   \(cm\)
 
Important!
Note: Enter your answer with 3 decimal digits