Question

An object is placed in front of concave mirror of radius of curvature 8 cm. Find  focal length

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Answer 1

Answer:

4

Explanation:

Focal length= r/2 = 8/2 =4

Answer 2

Given:

Radius of curvature,

r = 8 cm

To Find:

Focal length = ?

Solution:

As we know,

⇒  $Focal \ length= \frac{Radius}{2}$

i.e.,

⇒  $F=\frac{r}{2}$

On putting the estimated values, we get

⇒  $F=\frac{8}{2}$

⇒      $=4 \ cm$

So that the focal length will be "4 cm".