An object is placed at a distance of 12cm in front of a concave mirror of radius of curvature 30cm. List four characteristics of the image formed by the mirror.
CBSE DELHI - SET 3 2017
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Here u = -20cm, f = +15cm, v = ? Using mirror formula, we have,$\frac{1}{\text{v}}+\frac{1}{\text{u}}=\frac{1}{\text{f}}$
$\frac{1}{\text{v}}-\frac{1}{20}=\frac{1}{15}$
$\frac{1}{\text{v}}=\frac{1}{15}+\frac{1}{20}$
$\frac{1}{\text{v}}=\frac{4+3}{60}$
$\text{v}=\frac{60}{7}=8.5\text{cm}$
Therefore, the image formed behind the mirror and forms virtual, erect, diminished, image.
$\frac{1}{\text{v}}-\frac{1}{20}=\frac{1}{15}$
$\frac{1}{\text{v}}=\frac{1}{15}+\frac{1}{20}$
$\frac{1}{\text{v}}=\frac{4+3}{60}$
$\text{v}=\frac{60}{7}=8.5\text{cm}$
Therefore, the image formed behind the mirror and forms virtual, erect, diminished, image.
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