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

A series of fast moving still pictures can create an illusion of movement because.

  1. the eye can focus on very rapidly changing pictures

  2. eye is quicker than the brain

  3. the eye can separate two images only when the interval of separation between them is more than one-tenth of a second

  4. the optical cortex can see through the rapidly moving images
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Human eye cannot differentiate two images when the interval of separation between them is less than one-tenth of a second

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 part of human eye controls the amount of light entering the eye?

  1. Cornea

  2. Retina

  3. Pupil

  4. Iris
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Correct answer is (D)

Iris is the ring of pigmented tissue surrounding the pupil that varies in color from person to person, it contract and dilates to control the amount of light entering the eye through the pupil. The pupil is the opening in the center of the iris where light enters 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 presistence of the eye is only for:

  1. 1/100th of a second

  2. 1/120th of a second

  3. 1/16th of a second

  4. 1/200th of a second
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to Persistence of Vision theory, the human eye has the illusion of an after image still persisting. It is when our eye has the ability to persist for 1/16 of a second after the image has removed. It is used in animation to show fluent movement, normally after every two frames one picture would be shown, so for every 24 frames 12 pictures will be shown. This gives us the illusion of movement and the afterimage persists on our 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 is Not an advantage of having two eyes?

  1. It gives a wider field view.

  2. The ability to detect faint objects is enhanced with two detectors instead of one.

  3. It gives the ability to interpret the closeness of an object.

  4. It gives the eye higher protection from dust and pollution.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are several advantages of our having two eyes instead of one.
(i) It gives a wider field view because human being has a horizontal field view of about 150∘150∘ with one eye and of about 180∘180∘with two eyes.
(ii) The ability to detect faint objects is enhanced with two detectors instead of one.
(iii) With one eye, the world looks flat, i.e., two dimensional-only. With two eyes, the view is three dimensional.
As our two eyes are separated by a few centimeters each eye observes a slightly different image. Our brain combines the two views into one and we get to know how close or far away the things observed are.

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

Fill in the blanks:
The space between the cornea and the eyes lens is filled with a liquid called ___________ .

  1. aqueous humor

  2. vitreous humor

  3. ciliary muscles

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

The space between the cornea and the lens is called the aqueous chamber and contains a thin watery fluid called aqueous humor.

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

What is the name of the circular aperture through which light enters the eye ?

  1. Iris

  2. Pupil

  3. Cornea

  4. Optic Nerve
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct answer ( B )

Circular aperture through which light enters the eye is known as pupil.It is the black circle in the center of the iris, when the light reaches the tissues at the back of the eye, it is absorbed making the pupil look black. The pupil controls the amount of light that enters 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 change in focal length of an eye lens in human eye is caused by the action of the:

  1. Pupil

  2. Retina

  3. Ciliary muscles

  4. Iris
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ciliary muscle is located in the eye and surrounds the lens. It contracts or relaxes in order for an individual to see at multiple distances. When it contracts, it pulls forward, moving to a frontal portion to relax the fibers that hold the lens in place; this process also allows it to take on a more spherical shape to provide short range focus.

Hence, ciliary muscles changes the focal length of eye lens.


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

At the junction of the optic nerve and the retina, there are no sensory cells, so no vision is possible at that spot. This is called the blind spot.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At the junction from where optic nerve enters eye, there are no cone or rod cells to sense the image , and hence no vision is possible at that spot.Hence, it is called blind spot.

Given statement is $True.$