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Q: The focal length of a convex mirror is positive and the focal length of a concave mirror is negative.
  • A. focus
  • B. between focus (F) and center (C)
  • C. Center (C)
  • D. away from center (C)
Correct Answer: Option A - When an object is placed infinity in front of a concave mirror, its image is formed at the focus. The Principal focus of a concave mirror is the point on the principal axis where the rays of light coming parallel to the principal axis meet at the focus after reflection.
A. When an object is placed infinity in front of a concave mirror, its image is formed at the focus. The Principal focus of a concave mirror is the point on the principal axis where the rays of light coming parallel to the principal axis meet at the focus after reflection.

Explanations:

When an object is placed infinity in front of a concave mirror, its image is formed at the focus. The Principal focus of a concave mirror is the point on the principal axis where the rays of light coming parallel to the principal axis meet at the focus after reflection.