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Define the principal focus of concave mirror ??

Answer» It is a point on the principal axis at which the rays of light parallel to the principal axis meet after reflection or seem to come from. for a concave mirror the focus lies in front of the mirror .
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Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.\xa0Characteristics of image obtained by a concave mirrorThere are five cases through which one can understand the characteristics of image obtained by a concave mirror and they are as follows:\tObject placementImage obtainedImage characteristicsWhen the object is placed at infinityImage obtained is at the focal pointImage is a pointWhen the object is moved from infinity to center of curvatureImage move from focal point to center of curvatureThe size of the image is increased, real, and invertedWhen the object is at center of curvatureImage obtained is at center of curvatureThe size of the image remains the same, real, and invertedWhen the object move from center of curvature to focal pointImage move from center of curvature to infinityThe size of the image is bigger than the object, real, and invertedWhen the object is at focal pointImage is at infinityInfinitely bigWhen the object move from the focal point to mirrorImage move from minus infinity to mirrorThe size of the image decreases, larger than the object, virtual, and upright\t


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