Question

if focal length of a concave mirror is 8 cm then its radius of curvature will be​

Answer 1

Answer:

Radius of curvature,

r = 8 cm

To Find:

Focal length = ?

Solution:

As we know,

⇒ Focal \ length= \frac{Radius}{2}Focal length=

2

Radius

i.e.,

⇒ F=\frac{r}{2}F=

2

r

On putting the estimated values, we get

⇒ F=\frac{8}{2}F=

2

8

⇒ =4 \ cm=4 cm

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

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