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A concave mirror has a focal length of 20 cm. What is the radius of curvature of

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Question: A concave mirror has a focal length of 20 cm. What is the radius of curvature of the mirror? (2021)

Options:

  1. 10 cm
  2. 20 cm
  3. 30 cm
  4. 40 cm

Correct Answer: 20 cm

Exam Year: 2021

Solution: 

The radius of curvature (R) is twice the focal length (f). Therefore, R = 2f = 2 * 20 cm = 40 cm.

A concave mirror has a focal length of 20 cm. What is the radius of curvature of

Practice Questions

Q1
A concave mirror has a focal length of 20 cm. What is the radius of curvature of the mirror? (2021)
  1. 10 cm
  2. 20 cm
  3. 30 cm
  4. 40 cm

Questions & Step-by-Step Solutions

A concave mirror has a focal length of 20 cm. What is the radius of curvature of the mirror? (2021)
  • Step 1: Understand that a concave mirror has a focal length (f) which is given as 20 cm.
  • Step 2: Know the relationship between the radius of curvature (R) and the focal length (f). The formula is R = 2f.
  • Step 3: Substitute the given focal length into the formula. So, R = 2 * 20 cm.
  • Step 4: Calculate the result. R = 40 cm.
  • Focal Length and Radius of Curvature – The relationship between the focal length (f) and the radius of curvature (R) of a concave mirror, where R = 2f.
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