9). Which one of the following phrases most accurately describes paravial rays?

Question

9). Which one of the following phrases most accurately describes paravial rays? A) rays that pass through the principal focus B) any rays that are parallel to the principal axis C) rays that come to a focus on the principal axis D) rays close to the principal axis and parallel to it E) rays close to the principal axis, but not necessarily parallel to it 10). Which one of the following statements concerning the image formed by a concave spherical mirror is true? A) When the object distance is less than the focal length, the image is virtual. B) When the object distance is larger than the focal length, the image is virtual. C) When the object is at the center of curvature, the image is formed at infinity. D) When the object distance is less than the focal length, the image is inverted relative to the object. When the object distance is larger than the focal length, the image is upright E) relative to the object.

Explanation / Answer

10.option (a) is correct.

When object distance is less than focal length, image is virtual, erect and larger than object

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