Numerical problems — task. Science State Board, Class 10.

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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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