Tag: human eye and its working

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Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Match the following

List I List II
1 Aqueous humour a Forms inverted image on the retina
2 Vitreous humour b Spherical
3 Eyeball c Present between lens and retina
4 Crystalline lens d Present between lens and cornea

  1. 1-b, 2-c, 3-a, 4-d

  2. 1-d, 2-c, 3-b, 4-a

  3. 1-d, 2-a, 3-c, 4-b

  4. 1-a, 2-d, 3-b, 4-c
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Aqueous humour is a transparent, gelatinous fluid similar to plasma. It is present between the lens and the cornea. It helps in protection of the eye, provides nutrition to the eye, and allows exchange of gases & other substances between the eye & air. It also helps in maintaining the pressure in the eye. Vitreous humour is also a clear gelatinous gel like fluid that fills the space between the lens and the retina. It helps in maintaining the shape of the retina by holding the retina in its place. The eyeball is approximately spherical in shape with a diameter of about 2.3 cm. The crystalline eye lens provides the finer adjustment of focal length required to focus objects at different distances and forms an inverted real image of the object on the retina.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Which of the following statement is correct?

  1. Vitreous fluid helps to maintain the shape of the retina

  2. Crystalline eye lens helps in focusing the image

  3. Aqueous humour helps to maintain the pressure in the eye

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vitreous humour is a clear gelatinous gel like fluid that fills the space between the lens and the retina. It helps in maintaining the shape of the retina by holding the retina in its place. The crystalline lens helps in finer adjustments of focal length required to focus objects at different distances and forms an inverted real image of the object on the retina. Aqueous humour is present between the lens and the cornea and helps in maintaining the pressure in the eye

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

The following properties belong to which part of the eye?
a. It is present between the lens and the cornea.
b. It acts as a protective layer.
c. It maintains the pressure of the eye and provides nutrition.

  1. Iris.

  2. Aqueous humour

  3. Retina

  4. Vitreous humour
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Aqueous humour is a transparent, gelatinous fluid similar to plasma. It is present between the lens and the cornea. It helps in protection of the eye, provides nutrition to the eye, and allows exchange of gases & other substances between the eye & air. It also helps in maintaining the pressure in the eye.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

The curvature of the eye lens can be modified by _____ .

  1. ciliary muscles

  2. iris

  3. pupil

  4. cornea
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The eye lens is made up of a fibrous, jelly-like material. Its curvature can be modified to change its focal length to some extent by the ciliary muscles. When the muscles are relaxed, the curvature decreases making the lens thin and the focal length increases. Similarly when the ciliary muscles contract the curvature of the eye lens increases making them thicker, this decreases the focal length of the eye.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Which of the following optical phenomena is used in cinematography or movie projectors?

  1. Accomodation

  2. Persistence of vision

  3. Long sightedness

  4. Short sightedness
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Persistence of Vision is used in cinematography or movie projectors. Persistence of vision works because the human eye and brain can only process 10 to 12 separate images per second, retaining an image for up to a sixteenth of a second. If a subsequent image replaces it in this period of time it will create the illusion of continuity. Animation works by using an optical illusion. By presenting a sequence of still images in quick enough succession, the viewer interprets them as a continuous moving image. This is the same principle that enables live action film making and projection to work. Film theorists often refer to this illusion of movement as the persistence of vision.