University Physics Volume 3
17th Edition
ISBN: 9781938168185
Author: William Moebs, Jeff Sanny
Publisher: OpenStax
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Textbook Question
Chapter 2, Problem 1CQ
What are the differences between real and virtual images? How can you tell (by looking) whether an image formed by a single lens or mirror is real or virtual?
Expert Solution & Answer
To determine
The difference between real and virtual images. How can a real and virtual image can be distinguished just by looking?
Answer to Problem 1CQ
When the rays after reflection from mirror or refraction from lens actually meet, a real image is obtained. On the other hand, when the rays just appear to meet, a virtual image is formed. We can distinguish between the two just by looking as a real image is inverted but a virtual image is erect.
Explanation of Solution
Introduction:
An image of an object is formed when rays from the object reflect off a mirror or refract from a lens meet or appear to meet at a point. The characteristics of the image are determined by making ray diagrams.
The difference between real and virtual image is:
A real image is obtained when rays from the object after reflecting from the mirror or undergoing refraction from lens actually meet at a point. A real image can be obtained on a screen and a real image is always inverted.
On the other hand, a virtual image cannot be obtained on a screen because the rays after reflection or refraction do not actually meet but appear to meet. A virtual image is always erect.
One can tell whether the image is real or virtual just by looking if the image is inverted or erect. A real image is always inverted and a virtual image is always erect. In a metal spoon, we can see the inverted image formed at the concave side while erect image at the back side.
Conclusion:
Unlike virtual image, a real image can be obtained on screen. A real image is inverted and a virtual image is erect.
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Chapter 2 Solutions
University Physics Volume 3
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