When parallel rays of light are projected onto a convex mirror, the reflected rays will become scattered rays. If they extend in the opposite direction of the reflected rays to the back of the convex mirror surface, they can converge and intersect at one point, which is the main focus of the convex mirror (F ), is a virtual focus.
A straight line parallel to the main axis drawn from a certain point (A) of the object is the incident light. When the incident light reaches the surface of the spherical mirror, it is reflected. The straight line in the opposite direction after reflection is the reflected light. This reflected light must pass through the main focus (F) .
The line connecting the same point (A) of the object through the center of curvature (C) of the mirror is the secondary axis. The point (A′) where this secondary axis intersects with the reflected light passing through the main focus is where the object is imaged.
Convex mirrors are widely used and can be used for turning mirrors, wide-angle mirrors, etc. The most common ones are reversing mirrors and convex mirrors, which use the principle of light divergence to expand the field of view and better notice the situation of vehicles behind. (The back of the spoon is equivalent to a convex mirror, and the concave front is equivalent to a concave mirror).
Objects seen in a convex mirror are always deformed. An image distorted by a convex mirror can be restored using a convex mirror. Let’s do an experiment like this:
Draw a small house on the paper and place it in front of the spoon. The small house seen from the spoon is out of shape, and the raised house is twisted outwards. Draw the crooked house as accurately as possible on another piece of paper.
At this time, you place the newly drawn picture in front of the convex surface of the spoon. When you look inside, you will find that the crooked house has been corrected again, making it the same as the first drawing. If there is still some deformation, you can move your “convex mirror” back and forth, and finally you can find a suitable position to make the image in the convex mirror have a normal shape.
Post time: Dec-05-2023