Hold a magnifying glass over text and identify the distance where you can see the text bigger than they are written. Now move it away from the text. What do you notice? Which type of lens is a magnifying glass?
A magnifying glass is a convex lens.
When held close to the text, the letters appear enlarged and erect.
As the magnifying glass is moved away from the text, the letters initially appear larger but then become inverted at a certain distance. The image changes from erect and enlarged to inverted as the distance increases.
Explanation
The chapter describes in Activity 10.9 that when an object is placed behind a convex lens at a small distance, it appears erect and enlarged. As the distance increases, the object appears inverted—initially enlarged and then diminishing in size. A magnifying glass (shown in Fig. 10.14) is a convex lens used to read small print.
Solution Steps
A magnifying glass is a convex lens.
When held close to the text, the letters appear enlarged and erect.
As the magnifying glass is moved away from the text, the letters initially appear larger but then become inverted at a certain distance.
The image changes from erect and enlarged to inverted as the distance increases.