Question

To construct a ray diagram, we use two light rays which are so chosen that it is easy to know their directions after reflection from the lens. List the two rays and state the path of these rays after refraction. Use these two rays to locate the image of an object placed between and of convex lens.

Answer 1

Hint: In order to solve this question, we are going to first construct the ray diagram for the formation of image of an object placed between the pole and the focus of the mirror and list the two type of rays that are formed after refraction.

Complete step by step solution:
Let us first construct the ray diagram for an object lying in front of the concave mirror and the corresponding image formation.

The two types of rays that we need to list here in the question are:
i) The ray of light that is parallel to the principal axis, it passes through the point $ F $ of the concave mirror after its reflection.
Ii) The ray of light passing through the point $ C $ of the mirror, is reflected back on the same path after reflection from the mirror.
In the ray diagram below, as we can see that the object is placed in between the points and of the convex lens. In this case, the image is formed beyond the lens, is greater than the size of the image and is formed behind the $ 2F $ .

Note:
It is important to note that the convex lens and the concave mirror show a similar behavior in many cases, like those including the formation of a real or a virtual image. But specific cases of different objects placed at the different points for the convex lens and the concave mirror are completely different.