Question

find the focal length of concave mirror whose radius of curvature is 27 cm.

Answer 1

Answer:

5cm is the focal length

I hope it will help you

Answer 2

${Solution}$

Given :-

• Radius of curvature is 27cm

To find:-

• Focal length

Solution :-

We have the relation between the focal length and radius of curvature is

F = R/2

Where

• F = focal length
• R = radius of curvature

$\longrightarrow{F = \dfrac{R}{2}}$

$\longrightarrow{F = \dfrac{27cm}{2}}$

$\longrightarrow{F = 13.5 cm}$

$\red{\boxed{F = 13.5 cm}}$

So, the focal length is 13. 5cm

Know more:-

Properties of a plane mirror :-

• If the object is real then the image is virtual and vice versa
• Magnification of a plane mirror is always +1
• If the object is real, the image formed by plane mirror is virtual, erect , of same size and at the same distance from the mirror
• Plane mirror have the lateral inversion