What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm ?

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Solution

Object distance, u = -20 cm
Focal length, f = -20 cm (concave mirror) Image distance, v =?

We know that,
$1 over v plus 1 over u equals 1 over f fraction numerator begin display style 1 end style over denominator begin display style v end style end fraction plus fraction numerator begin display style 1 end style over denominator begin display style left parenthesis negative 20 right parenthesis end style end fraction equals fraction numerator begin display style 1 end style over denominator begin display style left parenthesis negative 20 right parenthesis end style end fraction 1 over v equals 0 v space equals space infinity space left parenthesis i n f i n i t y right parenthesis$
So image is at infinity.

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What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm ?

Object distance, u = -20 cm Focal length, f = -20 cm (concave mirror) Image distance, v =? We know that, So image is at infinity.