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23 Nov 2019

Write a paragraph defining focal length, object and image distance and magnification (include sign convention). Explain the difference between real and virtual images.

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Tod Thiel
Tod ThielLv2
2 Jun 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

An object that is 1.0 cm tall is placed on the principal axis of a convex mirror whose focal length is 15.0 cm. The base of the object is 25.0 cm from the vertex of the mirror. Make a ray diagram with two or the three rays that locate the image. Using the mirror equation and the magnification equation, and the proper sign convention, calculate the image distance and the magnification. Is the image real or virtual? Is the image inverted or upright comapred to the object? Is the image taller or shorter than the object?

A diverging lens has a focal length of magnitude 24.6 cm.

(a) Locate the images for each of the following object distances.
49.2 cm
distance       cm location        ---Select---   in front of the lens   behind the lens
24.6 cm
distance       cm location        ---Select---   in front of the lens   behind the lens
12.3 cm
distance       cm location        ---Select---   in front of the lens   behind the lens
(b) Is the image for the object at distance 49.2 real or virtual? realvirtual    
Is the image for the object at distance 24.6 real or virtual? realvirtual    
Is the image for the object at distance 12.3 real or virtual? realvirtual    
(c) Is the image for the object at distance 49.2 upright or inverted? uprightinverted    
Is the image for the object at distance 24.6 upright or inverted? uprightinverted    
Is the image for the object at distance 12.3 upright or inverted? uprightinverted    
(d) Find the magnification for the object at distance 49.2 cm.


Find the magnification for the object at distance 24.6 cm.


Find the magnification for the object at distance 12.3 cm.

Which of the following statements are true of virtual images? Identify all that apply. 

1. Virtual images are always upright.

2. Virtual images as formed by lenses are always located on the same side of the lens as the object. 

3. Virtual images are only formed by diverging lenses, never by converging lenses. 

4. Virtual images are always smaller than the object. 

5. An image of a real object is formed; the image distance (s' or di) for virtual image is a – value. 

6. An image of a real object is formed; the image height (h' or hi) for virtual images is a – value. 

7. Virtual images have a – magnification value. 

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