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Q: Which of the following statements is/are correct with regard to the principal axis of a spherical mirror? 1. A principal axis is an imaginary line extended on both sides of the mirror. 2. A principal axis passes through the center of curvature, principal focus and pole. 3. The principal axis for a curved mirror is curved.
  • A. Only 2 is correct
  • B. 1, 2 and 3 are correct
  • C. Only 1 is correct
  • D. Only 1 and 2 are correct
Correct Answer: Option D - Regarding to the principal 9 ×i of a spherical mirror- (i) A principal axis is an imaginary line extended on both side of mirror. (ii) A principal axis passes through the centre of curvature, principal focus and pole. (iii) the principal axis for a curved mirror is also straight line. So, only (i) and (ii) are correct.
D. Regarding to the principal 9 ×i of a spherical mirror- (i) A principal axis is an imaginary line extended on both side of mirror. (ii) A principal axis passes through the centre of curvature, principal focus and pole. (iii) the principal axis for a curved mirror is also straight line. So, only (i) and (ii) are correct.

Explanations:

Regarding to the principal 9 ×i of a spherical mirror- (i) A principal axis is an imaginary line extended on both side of mirror. (ii) A principal axis passes through the centre of curvature, principal focus and pole. (iii) the principal axis for a curved mirror is also straight line. So, only (i) and (ii) are correct.