PHY2049 - GENERAL PHYSICS II
PRACTICE QUIZ 32

Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 32, "Optical Images". This includes questions on plane, concave and convex mirrors and converging and diverging lenses. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.


Q1: A camera with a focal length of 0.050 m (a 50 mm lens) is focused for an object at infinity. To focus the camera on a subject which is 4.00 m away, how should the lens be moved?

1.0 cm closer to the film
0.06 cm closer to the film
4.94 cm closer to the film
0.06 cm farther from the film
4.94 cm farther from the film

Q2: A real object is 42 cm from a negative lens with f = ‹21 cm. The image is

real and 14 cm from the lens.
real and 42 cm from the lens.
virtual and 42 cm from the lens.
virtual and 21 cm from the lens.
virtual and 14 cm from the lens.

Q3: A 4.0 cm tall object is placed 30 cm from a converging lens that has a focal length of 10 cm as shown below.

What is the height and orientation of the image?

2 cm and upright
1 cm and inverted
2 cm and inverted
8 cm and upright
8 cm and inverted


Q4: An object 5.0 cm tall is placed 15 cm in front of a converging lens of focal length 30 cm. The final image size is

2.5 cm
3.3 cm
5.0 cm
7.5 cm
10 cm

Q5: A double-convex lens is made of glass of index of refraction 1.60. If the radii of curvature of the two surfaces are 10 cm and 20 cm, the focal length of the lens in air is

11.1 cm
-11.1 cm
25 cm
33.3 cm
-33.3 cm

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