Tag: human eye and its working

Quizzes (0) Questions (85)

Questions Related to human eye and its working

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

Refraction of light in the eye occurs at

  1. The pupil only

  2. The cornea only

  3. The lens only

  4. Both the cornea and the lens
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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 image formed on the retina of the eye is :

  1. Upright and real

  2. Virtual and upright

  3. Real and inverted

  4. Enlarged and real

  5. Larger than the object
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The lens system of the human eye acts as a convex lens, which forms a real and inverted image on the retina. The brain then interprets this image as upright.

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

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

 

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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 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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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 size of an object as perceived by an eye depends primarily on _____ .

  1. Actual size of the object

  2. Distance of the object from the eye

  3. Aperture of the pupil

  4. Size of the image formed on the retina
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Size of the object perceived by an eye depends primarily on distance of object from eye or eye lens. As magnification is given by:

$M=\dfrac{image\  distance}{object\  distance}$

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 kind of lens is there in our eyes? 

  1. concave

  2. convex

  3. Plano-concave

  4. Plano-convex
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.
Our eye lenses are convex lenses with variable focal lengths. The focal length of the eye lens is controlled by muscles according to the distance of the object from us that we are trying to see. The lens is flexible and when it is acted on by the ciliary muscle around it, the lens can be "flattened" to change the focus, or, when the muscle is relaxed, the lens can be assumed as having a more spherical shape. This is the principle of the eye to focus on objects nearer or farther away.

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 retina is a delicate spot that receives images through the eye lens and makes us see the world. If it gets detatched, it is very difficult to join it back. Therefore, eye surgeons use

  1. Laser-beams for welding the retina

  2. Sound waves for joining

  3. Micro-knives for surgery

  4. Ultraviolet rays for surgery
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Laser surgery around retinal tear is often able to weld the retina to the underlying eyewall. This can prevented or limit retinal detachment.

Therefore Ane$\rightarrow$ Laser beams are used by the eye. Surgeons for welding the retina

Multiple choice physics option c: imaging human eye and its working what is inside our eyes? human eye and defects of vision

The whitish part of eye mainly:

  1. provides characteristic colour to the eye

  2. acts as protective layer for the eye

  3. regulates the amount of light entering into the eye

  4. perceives the sensations
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Whitish part of eye is tough so that it can protect the eye from injuries.

It is white and transparent coat, known as cornea.

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

We are able to see objects around us because :

  1. The objects absorb all the light.

  2. The light reflected from the object enters our eyes.

  3. Light can be refracted.

  4. Light travels in straight lines.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We are able to see objects around us because the light reflected from the object enters our eyes.