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Q: The image of a star is obtained at F of a concave mirror when the incident ray is:
  • A. along the focal plane
  • B. perpendicular to principal axis
  • C. inclined to principal axis
  • D. parallel to principal axis
Correct Answer: Option D - The image of a star is obtained at F of a concave mirror when the incident ray is parallel to principal axis. The concave mirror is also called as converging mirror.
D. The image of a star is obtained at F of a concave mirror when the incident ray is parallel to principal axis. The concave mirror is also called as converging mirror.
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Explanations:

The image of a star is obtained at F of a concave mirror when the incident ray is parallel to principal axis. The concave mirror is also called as converging mirror.
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