If the radius of curvature of a concave mirror is 20 cm, what is its focal lengt
Practice Questions
Q1
If the radius of curvature of a concave mirror is 20 cm, what is its focal length? (2022)
5 cm
10 cm
15 cm
20 cm
Questions & Step-by-Step Solutions
If the radius of curvature of a concave mirror is 20 cm, what is its focal length? (2022)
Step 1: Identify the radius of curvature (R) of the concave mirror. In this case, R = 20 cm.
Step 2: Use the formula for the focal length (f) of a concave mirror, which is f = R / 2.
Step 3: Substitute the value of R into the formula: f = 20 cm / 2.
Step 4: Calculate the focal length: f = 10 cm.
Focal Length of Mirrors – The relationship between the focal length and the radius of curvature for concave mirrors, where the focal length is half the radius of curvature.
