The focal length of a Convex mirror is $10 c m$ . An object is placed before the convex mirror at $20 c m$ distance. Then
(i) where should he the image collected?
(ii) What are the properties of the image?

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Solution

Calculation using the general lens mirror formula
$P = 1 / F = \frac{n R}{i m g - s u r f} - \frac{n L}{o b j - s u r f}$
Reflection is a special case of refraction with refraction indices
$n R = - n L = - 1$
using your values C focal length is actually $- 10 m$ , since its a convex mirror. Same goes for biconcave lenses.
$\frac{1}{- 10} = \frac{- 1}{i m g - 0} - \frac{1}{- 20 - 0}$
$\frac{1}{i m g} = \frac{1}{10} + \frac{1}{20} = \frac{30}{200}$
$i m g = + 6.666 m 0$
Ans $6.666$ m

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The focal length of a Convex mirror is 10cm. An object is placed before the convex mirror at 20cm distance. Then (i) where should he the image collected?(ii) What are the properties of the image?

The focal length of a Convex mirror is $10 c m$ . An object is placed before the convex mirror at $20 c m$ distance. Then
(i) where should he the image collected?
(ii) What are the properties of the image?