Numerical Problems:
1. An object is placed at a distance of 20 \(cm\) from a convex lens of focal length \(10\) \(cm\). Find the image distance.
\(u\) \(=\) \(cm\)
\(f\) \(=\) \(cm\)
The lens formula is
Apply the known values in the formula,
The image distance \(v\) is \(cm\)
[Note: Give the final answer to the first decimal value by rounding off the second decimal value.]
2. An object of height \(3\) \(cm\) is placed at 9 \(cm\) from a concave lens of focal length \(15\) \(cm\). Find the distance of the image.
\(u\) \(=\) \(cm\)
\(h\) \(=\) \(cm\)
\(f\) \(=\) \(cm\)
Apply the known values in the lens formula,
The image distance \(v\) is \(cm\)
[Note: Give the final answer to the first decimal value by rounding off the second decimal value.]