Tag: physics

Questions Related to physics

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

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

  1. aqueous humor

  2. vitreous humor

  3. ciliary muscles

  4. crystalline lens

Show answer
Correct Option: A
Explanation:

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

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

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

  1. Iris

  2. Pupil

  3. Cornea

  4. Optic Nerve

Show answer
Correct Option: B
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.

The change in focal length of an eye lens in human eye is caused by the action of the:

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

  1. Pupil

  2. Retina

  3. Ciliary muscles

  4. Iris

Show answer
Correct Option: C
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.


Which of the following parts of the eye refracts light ?

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

  1. Pupil

  2. Iris

  3. Lens

  4. Retina

Show answer
Correct Option: C
Explanation:

Eye lens refract the light and form image on retina of eye .

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.

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

  1. True

  2. False

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Correct Option: A
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 $True.$

The size of the pupil is controlled by the iris.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Iris are the muscles that control the size of pupil to enable right amount of light to enter the eye.


Given statement is $True$.

Refraction of light in the eye occurs at

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

  1. The pupil only

  2. The cornea only

  3. The lens only

  4. Both the cornea and the lens

Show answer
Correct Option: D
Explanation:

Refraction of light in the eye occurs at both the cornea and the lens.

Like a camera, the human eye focuses light to produce sharp images. Light rays reflecting from distant objects are focused on the retina after they passed through the cornea.

Option D is correct.

The image formed on the retina of the eye is :

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

  1. Upright and real

  2. Virtual and upright

  3. Real and inverted

  4. Enlarged and real

  5. Larger than the object

Show answer
Correct Option: C

Match the following

i. Cornea a. Back surface of eye where image is formed
ii. Pupil b. Coloured part of eye
iii. Retina c. Membrane that refracts light and protects the eye
iv. Iris d. Transparent opening of eye.Light passes through it

 

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

  1. i-c ,ii-d,iii-a,iv-b

  2. i-a,ii-c,iii-b,iv-d

  3. i-d,ii-a,iii-b,iv-c

  4. i-b,ii-c,iii-d,iv-a

Show answer
Correct Option: A
Explanation:

Cornea is protective layer,it is transparent in nature. 

Pupil is the transparent opening of the eye. It lets light to pass through it.
Iris is responsible for characteristic colour of the eye.
Retina is the image forming screen of the eye.

Match the columns

i. amount of light entering into eye controlled by a. rodes 
ii. colour sensing cells  b. cones
iii.cells helping in vision in dim light c. iris
iv. junction of optic nerve and retina  d. blindspot
physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. i-a,ii-b,iii-c,iv-d

  2. i-d,ii-c,iii-b-iv-a

  3. i-c,ii-b,iii-a,iv-d

  4. i-b,ii-a,iii-c,iv-b

Show answer
Correct Option: C
Explanation:

Iris controls the amount of light entering the eye.
Cones are colour sensing cells.
Rode cells help in vision in dim light.
At the junction of optic nerve and retina  there are no rodes and cones.No image is formed at this point as it is insensitive to light.This point is called blind spot.