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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 \(cm\)
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