Tag: physics

Questions Related to physics

The impression of the image formed on the retina of the human eye remains for about:

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. $\dfrac{1}{10}s$

  2. $\dfrac{1}{24}s$

  3. $\dfrac{1}{16}s$

  4. $\dfrac{1}{20}s$

Show answer
Correct Option: C
Explanation:

The image formed on retina do not fade away instantaneously but its impression remains on the retina for about $\frac{1}{16}s$, even after removal of the object.

Aqueous humour is a _________ and  vitreous humour is a _________.

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. transparent jelly, viscousfluid

  2. transparent jelly, watery fluid

  3. viscous fluid, viscous fluid

  4. viscous fluid, transparent jelly

Show answer
Correct Option: D
Explanation:

The space between cornea and eye lens is filled with a viscous liquid called aqueous humour and the space between eye lens and retina contains a transparent jelly called vitreous humour.

Read the statements and mark the correct significance of eyelids:
a. It protects the eye from foreign objects.
b. It shut out the light when not required.
c. It makes the eyes beautiful.

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. a and b

  2. b and c

  3. a and c

  4. All are true

Show answer
Correct Option: A
Explanation:

Nature has provided eyes with eyelids to protect them from any object entering the eyes. It also shut off the light when not required.

There is a point in our eyes where no image is formed. That point is known as blind spot. Which animal do not have this 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. Fish

  2. Ostrich

  3. Octopus

  4. Rat

Show answer
Correct Option: C
Explanation:

The photoreceptors in the octopus retina are located in the inner part of the eye while the cells that carry information to the brain,are in the outer portion of its eye.

In dim 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. rods are sensitive but cones are not

  2. cones are sensitive but rods are not

  3. both rods and cones are sensitive

  4. neither rods nor cones are sensitive

Show answer
Correct Option: A
Explanation:

Rods and cones are light sensitive cells. Rods respond to different degrees of brightness and darkness. Cones respond mainly to colour of the incident light.

Mark the correct statement:
a. Blind spot position varies between the left eye and the right eye.
b. For both the eyes blind spot is not exactly in the same place.
c. Octopus do not have 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. a and b

  2. b and c

  3. a and c

  4. All

Show answer
Correct Option: D
Explanation:

Blind spot position varies in both eyes. Octopus do not have any blind spot.A point in our eyes where no image is formed,that point is known as blind spot.

Transparent front part of 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. pupil

  2. cornea

  3. iris

  4. retina

Show answer
Correct Option: B
Explanation:

Light enters the eye through a curved front surface known as cornea. It is transparent in nature.

The part of human eye which is sensitive to red, blue and green light 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. retina

  2. lens

  3. cornea

  4. iris

Show answer
Correct Option: A
Explanation:

Retina is the screen of eye. Photo-receptors like rodes and cones are present on retina. So it is sensitive to different colours.

The space between cornea and eye lens is filled with a liquid known as:

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 humour

  2. vitreous humour

  3. corneal fluid

  4. none of these

Show answer
Correct Option: A
Explanation:

The space between cornea and eye lens is filled with a viscous liquid known as  aqueous humour.

When light enters the eyes, most of the refraction occurs at 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. lens

  2. outer surface of cornea

  3. iris

  4. pupil

Show answer
Correct Option: B
Explanation:

When light enters the eyes, most of the refraction occurs at the outer surface of cornea. It is the whitish part of eye.