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: Which one of the following statements concerning the image formed by a concave spherical mirror is true?

When the object distance is less than the focal length, the image is virtual.
When the object distance is larger than the focal length, the image is virtual.
When the object is at the center of curvature, the image is formed at infinity.
When the object distance is less than the focal length, the image is inverted relative to the object.
When the object distance is larger than the focal length, the image is upright relative to the object.

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Q2: An object is placed in front of a concave spherical mirror as shown below. The three rays 1, 2, and 3, leave the top of the object and, after reflection, converge at a point on the top of the image. Ray 1 is parallel to the principal axis, ray 2 passes through F, and ray 3 passes through C.

Which ray(s) will reflect back on itself (themselves)?

1 only
2 only
3 only
both 1 and
1, 2 and 3

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Q3: The figure is a scaled diagram of a an object and a converging lens surrounded by air. Only one focal point, F, of the lens is shown.

The system is immersed in a fluid other than air that has an index of refraction that is larger than that of the lens. Which one of the following statements is true concerning this new situation?

The image will be real.
The image will be inverted.
The image will be enlarged relative to the object.
The image will be formed on the same side of the lens as the object.
The lens may act as a diverging lens or a converging lens depending on the location of the object.

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Q4: A diverging lens has a focal length of -10 cm. A 3 cm tall object is placed 25 cm from the lens. What is the magnification of the image?

+0.29
-0.29
+0.72
-0.72
+0.84

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Q5: A real object is placed 9.00 cm from a converging lens that has a focal length of 24.0 cm. The image is

0.119 cm from the lens, real, and smaller than the object.
0.119 cm from the lens, virtual, and smaller than the object.
14.4 cm from the lens, real, and enlarged.
14.4 cm from the lens, virtual, and enlarged.
11.7 cm from the lens, virtual, and enlarged.

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