Kneeling for the law of convex lens imaging (including the relationship between light source movement and image size)

The law of convex lens imaging means that the object is out of focus and forms an inverted real image on the other side of the convex lens. There are three kinds of real images: reduction, equal division and enlargement. The smaller the object distance, the larger the image distance and the larger the real image. The object is placed in focus and becomes an upright magnified virtual image on the same side of the convex lens. The smaller the object distance, the smaller the image distance and the smaller the virtual image.

Detailed imaging law imaging law convex lens imaging law

Application characteristics of object distance (U), image distance (V) and inverted size virtual reality

U & gt2f f<v & lt2f inverted miniature real-world camera-

U=2f v=2f Measure the demarcation point of the focal length of the inverted real image.

F<u & lt2f v & gt2f Inverted Magnifying Real Image Projector Slide Show Machine-

U=f does not image the virtual and real boundary point of focal length measurement of parallel light source.

U<f v>u is on the same side as the object. The virtual image of the vertical magnifying glass is on the same side of the object and behind it.

Text summary (1)

When the object is located beyond twice the focal length of the convex lens, it becomes an inverted reduced real image; When the object is located at twice the focal length of the convex lens, it becomes a real image with inverted size;

When the object is located between one focal length and two focal lengths of the convex lens, it becomes an inverted magnified real image; When the object is located at the focal length of the convex lens, it does not image;

When an object is located within a focal length of a convex lens, it becomes an upright magnified virtual image; When the object is infinitely far away, the image becomes a very small and bright point, and it is still a real image.

When forming a real image, the object image is on different sides of the convex lens; When a virtual image is formed, the object and the image are on the same side of the convex lens.

(2)

Twice the focal length to divide the virtual from the real,

Double focal length, divided into sizes.

Things are close, it seems far away, it seems bigger.

Things are far away, like entering, like getting smaller.

Note: the focal length refers to the distance from the point where the parallel light source converges on the main optical axis through the lens to the optical center of the lens, which can also be directly called the focal length; Twice the focal length means twice the distance.

Two demarcation points of convex lens imaging;

2f point is the dividing point of real image enlargement and reduction; Point f is the dividing point between real image and virtual image.

Lens imaging satisfies the lens imaging formula:

1/u (object distance)+1/v (image distance) = 1/f (lens focal length)

Edit the imaging rules and principles of this paragraph. Object Distance (U) Image Attribute Image Distance (V) Image Position Relationship.

U & gt2f handstand, zoom, real image F

U = 2f Inverted head, equal size, real image v = 2f The turning point of the image size, the reverse side of the image.

F<u & lt2f inverts and enlarges the reverse side of the real image v > 2f.

U = f no imaging/virtual/real, positive/negative, and the same side/different side transition of image and object.

U<f Erection, Magnification and Virtual Image v > u