Question

Point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. the image will form at:
1 point

Answer 1

Answer:

Image will form at 10 cm away and at opposite side of that of object

Explanation:

$mirror \: formula \\ \frac{1}{v} + \frac{1}{u} = \frac{1}{f} \\ focal \: length \: .f = 20cm( + ve \: for \: convex \: mirror \\ object \: distance \: .u = - 20cm \\ \frac{1}{v} + \frac{1}{ - 20} = \frac{1}{20} \\ \frac{1}{v} - \frac{1}{20} = \frac{1}{20} \\ \frac{1}{v} = \frac{1}{20} + \frac{1}{20} \\ \frac{1}{v} = \frac{2}{20} \\ \frac{1}{v} = \frac{1}{10} \\ v = 10cm$