Question

I need help anyone please helps me.. need correct answer and don't copy from internet

Question are in the above attachment ↑↑↑​

Answer 1

13a) I think cones (it require bright enviroment)
13b)Rods

14)True

15)I think it: Focuses light on the retina.

16)Eye lens

17) The shape of the lens in the eye affects the eye's ability to see objects clearly at different distances. Changing the shape of the lens allows you to adjust the focal length, which is necessary to focus the image on the retina and achieve clear vision of both near and distant objects.

18) When you focus on a nearby object, the ciliary muscles contract and cause the lens in your eye to change shape. This phenomenon is called accommodation. The lens becomes thicker and more rounded, which increases its ability to refract light, allowing the image of that close object to be focused onto the retina. Thanks to this process, the eye is able to adjust to different distances and achieve clear vision at both near and distant distances.

19)25 cm

20a) The far point of a normal human eye, also known as the "farthest point of distinct vision," is the distance at which the eye can see distant objects clearly without any accommodation. For a typical human eye, the far point is considered to be infinity, as light rays from distant objects are parallel and do not require any focusing to form a clear image on the retina.

20b) The near point of the human eye, also known as the near point of accommodation, is the closest distance at which the eye can focus on an object without straining. In young adults with normal vision, this point is typically around 25 centimeters (about 10 inches) from the eye. However, as people age, the flexibility of the lens decreases, causing the near point to move farther away.

21) The normal human eye has a horizontal field of view of about 135 degrees and a vertical field of view of about 160 degrees.

22) The part of our eyes that helps us focus on near and distant objects in quick succession is the "lens."

23) The "power of accommodation" refers to the ability of the human eye to adjust its focus on objects at different distances. This adjustment is achieved through changes in the curvature of the lens within the eye, allowing it to focus light accurately onto the retina and provide clear vision for objects at varying distances.

24:
A) Optic nerve
B) Ciliary muscles
C) Pupil
D) Cornea
E) Lens

25:
A) Cornea
B) Retina
C) Iris
D) Dilated
E) Light
F) Lens
G) Thicker
H) Thicker

Im not sure, but you can check internet to be sure.

Answer 2

Your Answer :-

13.

• (a) Cones detect color.
• (b) Rods work in dim light.

_____________________

14. True, the image formed on our retina is upside-down.

_____________________

15. The principal function of the eye-lens is to focus light onto the retina, allowing us to see objects clearly.

_____________________

16. The greatest degree of refraction of light occurs in the cornea.

_____________________

17. The shape of the lens in the eye changes due to the contraction or relaxation of the ciliary muscles.

_____________________

18. The ciliary muscles contract to make the lens thicker when focusing on a nearby object.

_____________________

19. The least distance of distinct vision for a normal human eye is about 25 cm.

_____________________

20.

• (a) The far point of a normal human eye is infinity.
• (b) The near point of a normal human eye is about 25 cm.

_____________________

21. The range of vision of a normal human eye is approximately 120 degrees horizontally and 90 degrees vertically.

_____________________

22. The part of our eyes that helps us to focus near and distant objects in quick succession is the ciliary muscles and the lens.

_____________________

23. The "power of accommodation" of the human eye refers to its ability to adjust the focal length of the lens in order to focus on objects at varying distances.

_____________________

24.

• (a) Optic nerve.
• (b) Ciliary muscles.
• (c) Pupil.
• (d) Cornea.
• (e) Lens.

_____________________

25.

• (a) Most of the refraction of light rays entering the eye occurs at the outer surface of the cornea.
• (b) The part of the eye sensitive to light is the retina.
• (c) The part of the eye which alters the size of the pupil is the iris.
• (d) When light is dim, the pupil becomes dilated.
• (e) The iris controls the amount of light entering the eye.
• (f) The ciliary muscles control the shape of the lens.
• (g) To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be thinner.
• (h) To bring light from a near object to a focus on the retina of the eye, the convex eye-lens needs to be thicker.

_____________________

Hope it's helpful!.. ^_^