3. [5pt] An object is placed 13.5 cm in front of a convex mirror that has a foca

Question

3. [5pt]
An object is placed 13.5 cm in front of a convex mirror that has a focal length of -24.5 cm. Determine the location of the image. (Denote virtual images with negative distances.)

Answer:  
4. [5pt]
What is the magnification of the object in the previous problem?

Answer:  Last Answer: 0.84 m/s
Not yet correct, tries 1/20
6. [5pt]
A 0.54 cm high object is placed 8.5 cm in front of a diverging lens whose focal length is -7.5 cm. What is the height of the image?

Answer:  Last Answer: 0.84 m/s
Not yet correct, tries 0/20

A magnifying glass uses a converging lens with a focal length of 15.5 cm. It produces a virtual and upright image that is 3.1 times larger than the object.
7. [5pt]
How far is the object from the lens?

Answer:  
8. [5pt]
What is the image distance?

Answer:  Last Answer: DACACBE
Incorrect, tries 2/20.

Explanation / Answer

3)
f = -24.5 cm
do = 13.5 cm
use:
1/f = 1/di + 1/do
-1/24.5 = 1/di + 1/13.5
di = -8.7 cm
Answer: -8.7 cm

5)
m = -di/do
    = 8.7/13.5
     =0.64

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