Question

5. An image in a concave mirror has a position of 18.0cm and its object has a position of 15.0cm. What is the focal length of the mirror?

Answer 1

Answer:

f=90/11

Explanation:

1/v+1/u=1/f

1/18+1/15=1/f

Answer 2

f = focal length of the mirror = 8.18 cm.

Given:

An image in a concave mirror has a position of 18.0cm

Its object has a position of 15.0cm.

To find:

The focal length of the mirror.

Formula used:

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

Where u= Image position.

           v = object position.

           f = focal length of the mirror.

Explanation:

u= Image position =  18.0cm

v = object position = 15.0cm.

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

     $\frac{1}{15}$ + $\frac{1}{18}$ = $\frac{1}{f}$

f = focal length of the mirror = 8.18 cm.

To learn more....

1)Why concave mirror is known as converging mirror and convex mirror is known as diverging mirror? Write an answer to the point with the keywords.

https://brainly.in/question/7936322