Image formation through spherical lenses diagrams
Answers
Answer:
Explanation:
Double convex lenses have focal points on both sides of the lens, but it is also necessary to use points at twice the focal length to locate objects and images. Therefore, along the principal axis, there are points identified as F and as 2F on both sides of the lens.
As with mirrors, we only need to trace two rays in order to locate the image for lenses. Both rays change direction while inside the lens, and their convergence point on the opposite side of the lens is the image location. As can be seen in the figure above, Ray 1 approaches the lens parallel to the principal axis and is refracted through the focal point on the other side. Ray 2 travels through the focal point and is then refracted parallel to the principal axis. The yellow arrow on the right of the lens is the inverted image.
The diagram above shows the situation when the object is outside 2F. In this situation, the image will be between F and 2F on the other side and will be inverted, diminished, and real. A real image can be projected on a screen. That is, if you placed a sheet of paper at the image position, the image would actually appear on the paper.
If the object is placed between 2F and F, the image will appear beyond 2F on the other side. The image will be real, inverted, and enlarged. You can draw a ray tracing diagram like the one shown to demonstrate this is true.
If the object is placed inside F (between F and the lens), the image will be on the same side of the lens as the object and it will be virtual, upright, and enlarged.