Lenses & the Eye Quiz
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5 questions, one answer each
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1. How does a lens form an image?
- A. By reflecting light off its surface
- B. By refracting light as it passes through
- C. By absorbing and re-emitting light
- D. By diffracting light around its edges
2. What type of image is formed when an object is placed within the focal length of a convex lens?
- A. Real, inverted, diminished
- B. Virtual, upright, magnified
- C. Real, upright, same size
- D. Virtual, inverted, diminished
3. An object 2 cm tall forms an image 8 cm tall. What is the magnification?
- A. 2
- B. 4
- C. 6
- D. 16
4. What structure in the eye changes shape to focus light from objects at different distances?
- A. The retina
- B. The lens
- C. The pupil
- D. The cornea
5. A student has trouble focusing on close objects but can see distant objects clearly. Which lens would correct this, and why?
- A. A concave lens, because it diverges light to spread the focus out further
- B. A convex lens, because it adds extra converging power needed to focus close objects onto the retina
- C. A concave lens, because it removes light from entering the eye
- D. No lens is needed since this is normal vision