Question: If the radius of curvature of a convex mirror is 30 cm, what is its focal length?
Options:
10 cm
15 cm
20 cm
30 cm
Correct Answer: 15 cm
Solution:
The focal length f of a mirror is given by f = R/2. For a convex mirror, R = 30 cm, so f = 30/2 = 15 cm.
If the radius of curvature of a convex mirror is 30 cm, what is its focal length
Practice Questions
Q1
If the radius of curvature of a convex mirror is 30 cm, what is its focal length?
10 cm
15 cm
20 cm
30 cm
Questions & Step-by-Step Solutions
If the radius of curvature of a convex mirror is 30 cm, what is its focal length?
Step 1: Understand that the radius of curvature (R) of the convex mirror is given as 30 cm.
Step 2: Recall the formula for the focal length (f) of a mirror, which is f = R/2.
Step 3: Substitute the value of R into the formula: f = 30 cm / 2.
Step 4: Calculate the focal length: f = 15 cm.
Focal Length of Mirrors – The relationship between the radius of curvature (R) and the focal length (f) of mirrors, specifically that f = R/2 for convex mirrors.
Soulshift Feedback×
On a scale of 0–10, how likely are you to recommend
The Soulshift Academy?
