Question

A concave lens has focal length of 20cm. At what distance from the lens a 5cm tall object be placed so early hat it forms an image at 15cm the images formed? ​

Answer 1

Answer:

$so \: the \: object \: should \: be \: placed \: 3cm \: from \: the \: mirror \:$

Step-by-step explanation:

$20cm - 15cm = 5cm \\ 15cm \div 5cm \: = 3cm$

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