Question

An object of size 4 cm is paced at 15 cm in front of concave mirror of radius of curvature 20 cm. Find position, size and nature of the image.

Answer 1

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• h = 4cm
• u = -15cm
• f = -10cm
• Using mirror formula
• $\frac{1}{v} = \frac{1}{ - 10} + \frac{1}{15}$
• $v = - 30cm$
• $m = \frac{h}{ho} = \frac{h}{4}$
• $m = \frac{ - v}{u} = \frac{30}{ - 15}$
• $h = \frac{120}{ - 15} = - 8cm$
• Image is Magnified, Real and Inverted