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If the radius of curvature of a concave mirror is 20 cm, what is its focal lengt

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Question: If the radius of curvature of a concave mirror is 20 cm, what is its focal length? (2022)

Options:

  1. 5 cm
  2. 10 cm
  3. 15 cm
  4. 20 cm

Correct Answer: 10 cm

Exam Year: 2022

Solution: 

The focal length (f) of a concave mirror is given by f = R/2, where R is the radius of curvature. Thus, f = 20 cm / 2 = 10 cm.

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)
  1. 5 cm
  2. 10 cm
  3. 15 cm
  4. 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.
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