Question

An object is placed 20cm in front of a convex mirror of focal length 20cm.find the position and size of the image???​

Answer 1

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u = -20 cm

f = 20 cm

v= ?

using mirror formula

$\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$

$\frac{1}{v} + \frac{1}{( - 20)} = \frac{1}{20}$

$\frac{1}{v} - \frac{1}{20} = \frac{1}{20}$

$\frac{ 1}{v} = \frac{1}{20} + \frac{1}{20}$

$\frac{1}{v} = \frac{1 + 1}{20}$

v = 10 cm

Image

formed between pole and focus

small size or Diminished

virtual and erect

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