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Q: The radius of curvature of a concave mirror is 12 cm. Following New Cartesian Sign Convention, the principal focus is located at x = ________.
  • A. 6 cm
  • B. –12 cm
  • C. –6 cm
  • D. 12 cm
Correct Answer: Option C - Light rays that are parallel to the principle axis of concave mirror converge at specific point on its principle axis after reflecting from the mirror. This point is known as principle focus of the concave mirror. Value of Principle focus of concave mirror is always negative. F= R/2 = 12/2 = – 6
C. Light rays that are parallel to the principle axis of concave mirror converge at specific point on its principle axis after reflecting from the mirror. This point is known as principle focus of the concave mirror. Value of Principle focus of concave mirror is always negative. F= R/2 = 12/2 = – 6

Explanations:

Light rays that are parallel to the principle axis of concave mirror converge at specific point on its principle axis after reflecting from the mirror. This point is known as principle focus of the concave mirror. Value of Principle focus of concave mirror is always negative. F= R/2 = 12/2 = – 6