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Q: The focal length of a convex mirror is :
  • A. infinite
  • B. zero
  • C. negative
  • D. positive
Correct Answer: Option D - The distance from the lens to the focal point is called the focal length for diverging or convex the focal length is always positive. Converging or concave mirror, the focal length is always negative.
D. The distance from the lens to the focal point is called the focal length for diverging or convex the focal length is always positive. Converging or concave mirror, the focal length is always negative.

Explanations:

The distance from the lens to the focal point is called the focal length for diverging or convex the focal length is always positive. Converging or concave mirror, the focal length is always negative.