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If the radius of curvature of a concave mirror is 40 cm, what is its focal lengt

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Question: If the radius of curvature of a concave mirror is 40 cm, what is its focal length?

Options:

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

Correct Answer: 20 cm

Solution: 

The focal length f of a mirror is given by f = R/2. Thus, f = 40 cm / 2 = 20 cm.

If the radius of curvature of a concave mirror is 40 cm, what is its focal lengt

Practice Questions

Q1
If the radius of curvature of a concave mirror is 40 cm, what is its focal length?
  1. 10 cm
  2. 20 cm
  3. 30 cm
  4. 40 cm

Questions & Step-by-Step Solutions

If the radius of curvature of a concave mirror is 40 cm, what is its focal length?
Correct Answer: 20 cm
  • Step 1: Understand that the radius of curvature (R) of the concave mirror is given as 40 cm.
  • Step 2: Know 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 = 40 cm / 2.
  • Step 4: Calculate the focal length: f = 20 cm.
  • Focal Length of Mirrors – The relationship between the radius of curvature (R) and the focal length (f) of a mirror, where f = R/2.
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