Grade 9 Science: Lenses
This worksheet covers the basics of lenses, including convex and concave lenses, their properties, and how they form images. Suitable for Grade 9 science students.
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Grade 9 Science: Lenses
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. Which type of lens converges parallel rays of light to a single focal point?
Concave lens
Convex lens
Plano-concave lens
Plano-convex lens
2. An object is placed at 2F (twice the focal length) from a convex lens. The image formed will be:
Real, inverted, and magnified
Real, inverted, and same size
Virtual, erect, and magnified
Virtual, erect, and diminished
3. A concave lens is also known as a lens because it spreads out parallel rays of light.
4. The distance between the optical center of a lens and its principal focus is called the .
5. When light passes from a less dense medium to a more dense medium, it bends the normal.
6. A convex lens always forms a real and inverted image.
True
False
7. The image formed by a concave lens is always virtual, erect, and diminished.
True
False
8. Draw a ray diagram for a convex lens when an object is placed beyond 2F (twice the focal length). Describe the nature, position, and size of the image formed.
9. Explain the difference between a real image and a virtual image.
Match the lens type with its characteristic.
10. Convex Lens
a. Diverging lens
11. Concave Lens
b. Converging lens
12. A student uses a lens to magnify a small insect. What type of lens are they most likely using, and where is the insect placed relative to the lens to achieve magnification?
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