The human eye

9.Which statement about the cornea is true?

10.The nerve in the eye carries signals from the retina to the:

11.If a lens is more curved, what happens to the amount of refraction?

12.The pupil appears larger in the dark because:

13.When a person looks at a distant object, the lens in their eye becomes flatter. How does this change the focal length of the lens?

14.The diagram shows two convex lenses, A and B. Lens A has a longer focal length than lens B. Which lens is more curved?

15.Which part of the eye refracts light the most?

16.In bright light, the iris muscles contract to make the pupil smaller. What is the purpose of this?

17.A student measures the focal length of a convex lens and finds it to be 10 cm. If the lens is replaced by one that is more curved, what would the new focal length most likely be?

18.A ray of light enters the eye at the cornea and then passes through the lens. Which of the following correctly describes the path of the ray?

19.The table shows the pupil diameter of a person in different light conditions. Which row is correct?

20.A student investigates how the focal length of a lens changes with curvature. She measures the focal length of three lenses with different curvatures. Which graph best shows the relationship?

21.In an experiment, a ray of light is directed at a convex lens parallel to its principal axis. After passing through the lens, the ray:

22.Which of the following statements about the retina is correct?

23.What is the function of the nerve in the eye?

24.In an experiment, a student uses a ray box to shine parallel rays of light at a convex lens. She places a screen behind the lens and moves it until the rays converge to a sharp point. What is this point called?

25.A student measures the focal length of a convex lens and finds it to be 12 cm. She then uses a lens with a greater curvature. What would be the new focal length?

26.In an experiment to find the focal length of a convex lens, a student uses a distant object. Why is a distant object used?

27.A student sets up a ray box, a convex lens, and a screen. She moves the screen until a sharp image of the ray box is formed. What does the distance from the lens to the screen represent?

28.Which part of the eye changes shape to focus light from objects at different distances?

29.The diagram shows a ray of light entering the eye. In which order does light pass through the structures?

30.A student investigates how the curvature of a lens affects its focal length. She uses three lenses with different curvatures and measures their focal lengths. Which graph correctly shows the relationship between curvature and focal length?

31.In an experiment, a student shines a ray of light at a convex lens parallel to its principal axis. After passing through the lens, the ray:

32.What is the function of the iris in the eye?

33.A student sets up a convex lens and a screen. She places an object at a distance greater than the focal length from the lens. What type of image is formed on the screen?

34.Why is the pupil smaller in bright light?

35.A student uses a convex lens to form an image of a lamp on a screen. She covers the top half of the lens with a card. What happens to the image?

36.Which part of the eye is a transparent layer at the front that refracts light?

37.What is the function of the retina in the human eye?

38.Which part of the eye is the dark area in the middle where light passes through?

39.A convex lens is used in the human eye. Which of the following is a property of a convex lens?

40.In the human eye, which part changes shape to focus light from objects at different distances?

41.The cornea contains cells that can detect light and colour.

42.The iris is the coloured part of the eye.

43.Which part of the eye refracts light and can change shape to focus on objects at different distances?

44.The retina is sensitive to light and can be damaged by very bright light.

45.Arrange the following structures in the order that light passes through them when entering the eye:

46.Which statement explains why the pupil is smaller in bright light?

47.A lens that is wider in the middle than at the edges is called a convex lens.

48.Match each part of the eye with its function.

49.Which of the following are uses of convex lenses? (Select all that apply)

50.Place the following structures in the order that light passes through them when entering the eye.

51.Complete the sentence:

52.State three uses of convex lenses.

53.Label the parts of the eye:

54.Complete the sentence.

55.A student measures the focal length of a convex lens and finds it to be 15 cm. If the lens is replaced by one that is more curved, what would be the new focal length? (Assume the more curved lens has half the focal length of the less curved lens)

56.Describe why the pupil appears larger on someone when it is dark, and smaller when it is very bright.

57.Using the diagram of two lenses with different curvatures, describe why the focal length of lens a is more than that of lens b.

58.A student measures the focal length of a convex lens and finds it to be 15 cm. If the lens is replaced by one that is more curved, what would be the new focal length? (Assume the more curved lens has half the focal length of the less curved lens)