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Question 1
Lenses are used in glasses to correct vision for long-sightedness and short-sightedness. The diagram below shows light about to pass through a lens. |
a) | State the name of the point labelled F.
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b) | Complete the diagram to show the rays of light as they pass through the lens.
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c) | State the name of this type of lens.
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Question 2
Converging lenses are used in cameras to focus light on a film where an image is formed. |
a) | The diagram below shows an object and a converging lens. Complete the diagram to show the location and size of the image produced.
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Question 3
Lenses can be used to produce magnified or diminished images. |
a) | Describe the image formed by the converging lens.
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b) | The object is brought closer to the lens. Draw two rays of light to show the location of the image formed.
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c) | Describe the image formed when the object is closer than the focal point.
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Question 4
a) | An object is placed at three times the focal length of a convex lens. How will the image of the object appear when light rays pass through the convex lens? A real and inverted B virtual and upright C real and upright D virtual and inverted
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b) | Which of the following describes how light behaves as it passes through a convex lens? A all light rays refract as if they originated at the principal focus before the lens B all light rays refract to pass through the focal point after the lens C all light rays refract to be parallel to the principal axis after passing through the lens
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Question 5
Optometrists use different power lenses to correct for varying levels of vision defects. |
a) | Which lens is the most powerful? A B C
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The diagram below shows light as it passes through a convex lens to form an image. |
b) | Complete the table below by putting a tick in the rows which correctly describe the image formed by the light as it passes through the convex lens above.
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Question 6
Concave lenses cause light rays to disperse as they pass through the lens. Convex lenses cause light converge at the principal focus of the lens. |
a) | Which of the following lenses is a concave lens? B
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b) | The diagram below shows an object and a concave lens. Complete the diagram by drawing two rays of light to identify the location of the image formed.
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c) | Describe the image formed.
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Question 7
This question is about using lenses to produce magnified images of objects. |
A student is using a magnifying glass to view small text in a book. They notice that the size of the text changes as the distance from the lens to the book varies. |
a) | When the text appears larger than the original text, the image is and the magnification is greater than . If the text appears smaller than the original text, the image is . The image formed by a magnifying glass is . magnified 1 diminished virtual
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b) | The image below shows the image formed by the magnifying glass at one particular distance. |
The image below shows the image formed by the magnifying glass. Describe the image formed.
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c) | The student wants to make the image larger. Describe how they should vary the distance between the lens and the object.
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