Question

if the radius of curvature of lens 60cm,then what is it focal length​

Answer 1

Answer:

30cm(magnitude)

Explanation:

f=R/2,(R is the magnitude of radius of curvature)

Answer 2

Given:

Lens with -

• Radius of curvature lens = 60 cm

What To Find:

We have to find -

• The focal length of the lens.

How To Find:

To find we have to -

• We have to know that the focal length is always half of the radius of the curvature.
• So, we will divide the radius of curvature with two (half means 2 parts) to get the focal length that is our results.

Formula Needed:

The formula is -

$\pmb{f = \dfrac{R}{2}}$

Abbreviations Used:

• f  = Focal length
• R = Radius of curvature

Solution:

Using the formula,

$\sf \longrightarrow \: f = \dfrac{R}{2}$

Substitute the values,

$\sf \longrightarrow \: f = \dfrac{60}{2}$

Divide 60 by 2,

$\sf \longrightarrow \: f = 30 \: cm$

Final Answer:

∴ Thus, the focal length is 30 cm.