Concave Mirror The center C of a concave mirror is outside the mirror.
Focal point F is also outside the mirror, half way between the center and the surface of the mirror. The focal length f is half of the radius. Significance of the focal point All light rays that are parallel to the axis will pass (after extrapolating for convex
mirror) through the focal point! For a concave mirror, the light can pass through the focal point. Image from a concave mirror: case 1 Step 1
Step 3 Step 2 Step 4
Image from a concave mirror: case 1 Properties of the Image If we put an object outside of the center of a concave mirror, we find the image is
Real, in the sense that all light rays pass through the image. Inverted, in the sense that the direction of the arrow has been changed. The image is smaller!
Animation for case 1 Image for a concave mirror: case 2
If the object is in between the center and the focal point, the image is Real Inverted Magnified in the sense that the image is bigger
than the real object. The direction of the light rays can be reversed and the result is still physically possible! (or the image and object
interchanged) Animation for case 2 Image from a concave mirror: case 3 Image from a concave mirror: case 3
Animation for case 3 Properties of the image If the object is closer to the mirror than the focal point F, the image is
Virtual, it is behind the mirror Upright, not inverted Magnified Can be used for shaving!
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