Question

The radius of curvature of a concave mirror is 50 cm. Where should an object be placed from the mirror
so as to form its image at infinity?

Answer 1

Answer:

at focus

Explanation:

if object is at focus and mirror in concave, the image forms at infinity .

Answer 2

Given :-

The radius of curvature of a concave mirror = 50 cm

To Find :-

Where should an object be placed from the mirror  so as to form its image at infinity.

Analysis :-

Here we are given with the radius of curvature of a concave mirror.

In order to find the focal length substitute the given values from the question such that focal length is equal to radius divided by two.

Solution :-

We know that,

• f = Focal length
• r = Radius

Using the formula,

$\underline{\boxed{\sf Focal \ length=\frac{Radius}{2} }}$

Given that,

Radius (r) = 50 cm

Substituting their values,

⇒ f = r/2

⇒ f = 50/2

⇒ f = 25 cm

Therefore, the radius of curvature of a concave mirror is 50 cm.