Question

It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens? If you keep on decreasing the distance between the object and the lens, will you still be able to obtain the image on the screen? Explain.

Answer 1

Convex lens

1. The convex lens converges light rays that travel parallel to its principal axis (i.e. converges incident rays towards the principal axis) and is comparatively thick in the middle and thin at the lower and upper edges.
2. Instead of curving inside, the edges curl outward. It is placed in front of the eye to sharply bend incoming light, causing the focal point to shorten and the light to focus properly on the retina.
3. Because it converges a parallel beam of light on a point called the principal focus, a convex lens is termed a converging lens.
4. A converging lens is a convex lens that increases the size of the picture as the distance between the object and the lens decreases.
5. Taking an example, the distance between object and lens is 80 cm. The size of the image is -33.33.
6. If we decrease the distance between object and lens by 20 cm. The size of the image becomes -40.00 cm.

Conclusion

If the distance between the object and the lens is constantly decreasing, we will not be able to capture an image on the screen since the image formed when the object is positioned very close to the convex lens is virtual. Virtual images are impossible to obtain on a screen.