Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement is correct?

A
Vitreous fluid helps to maintain the shape of the retina

B
Crystalline eye lens helps in focusing the image

C
Aqueous humour helps to maintain the pressure in the eye

D
All of the above

Solution

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
Question 2
1 / -0

A glass prism has how many rectangular surfaces?

A
$$3$$

B
$$4$$

C
$$2$$

D
$$1$$

Solution

The structure of glass prism is as shown in figure. It has three rectangular surfaces - ABCF, BCDE and AFDE.
Question 3
1 / -0

The path of a ray of light passing through a glass prism is shown below :
In this diagram the angle of prism, angle of incidence, angle of emergence and angle of deviation respectively have been represented by:

A
O, Y, Z and N,

B
P, Y, M and Z,

C
O, X, M and Z

D
P, X, Z and N

Solution

Angle of prism $$= \angle O$$ , (angle between two refracting surfaces)
Angle of incidence $$= \angle X$$ (angle between incident ray and normal) ,
Angle of emergence $$= \angle M$$ (angle between emergent ray and normal)
Angle of deviation $$= \angle Z$$ (angle between incident ray and emergent ray)
Question 4
1 / -0

A person cannot see objects clearly beyond 50cm. The power of lens to correct the vision is

A
+5D

B
-2D

C
-0.5D

D
+2D

Solution

A person cannot see beyond 50 cm. Hence, he should use a concave lens of 50 cm focal length.Hence $$Power=\dfrac{-100}{50} =-2 D$$
Question 5
1 / -0

Red and blue beams of light is incident on a prism as shown in the figure. Which of the following statements is true?

A
The blue light bends more than the red light as the blue light has a longer wavelength.

B
The red light bends more than the blue light as the red light has a longer wavelength.

C
The blue light bends more than the red light as the blue light has a shorter wavelength.

D
The red light bends more than the blue light as the red light has a shorter wavelength.

E
The red and blue lights bend by the same amount as all colors of light refract equally.

Solution

Different colours of light bend through different angles with respect to the incident ray, as they pass through a prism. The red light bends the least while the violet the most.
It is because the refractive index of glass is more for shorter wavelength than for longer wavelengths. Since blue light has a shorter wavelength than red light, so blue light bends more.

Option C is correct.
Question 6
1 / -0

The human eye forms the image of an object at its :

A
cornea

B
iris

C
pupil

D
retina

Solution

$$\textbf{Explanation}$$
$$\bullet$$The screen of the eye on which the image is formed is known as retina.
$$\textbf{Hence option D correct}$$
Question 7
1 / -0

Due to which phenomena the combination of red, green and blue forms the same white colour

A
Due to persistence of vision

B
Due to reflection

C
Due to refraction

D
Due to deviation

Solution

The above question can be understood by Newton Disc experiment.
The Newton disc, also known as the Disappearing Colour Disc, is a well-known physics experiment with a rotating disc with segments in different colors (usually Newton's primary colors: red, orange, yellow, green, blue, indigo, and violet or VIBGYOR) appearing as white (or off-white or gray) when it spins very fast.
The reason of white color appearance on spinning is persistence of vision.
Persistence of vision traditionally refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye.
Due to this when a new color reaches our eyes previous color is still felt by our eyes and previous colors and succeeding colors combined together to form white color hence the rotating disc appears white because due to persistence of vision all colors are felt by our eyes at same time and combined together they appear white .
Question 8
1 / -0

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

A
pupil

B
retina

C
ciliary muscles

D
iris

Solution

The answer is C.
The ciliary muscle is a circular muscle that relaxes or tightens the zonules to enable the lens to change shape for focusing. The zonules are fibers that hold the lens suspended in position and enable it to change shape during accommodation. It increases or decreases the focal length of the eye lens.
Question 9
1 / -0

A parallel beam of light falling on the eye gets focused on the retina because of refraction at

A
The cornea

B
The crystalline lens

C
The vitreous humor

D
Various surfaces in the eye

Solution

Most of the refraction for the light rays entering the eye occurs at the outer surface of the cornea.
Question 10
1 / -0

The power of accommodation for the normal eye is

A
4 D

B
40 D

C
44 D

D
400 D

Solution

Normal vision length = $$25\ cm$$
Thus, the focal length is $$f = 0.25 m$$
Power $$P=\dfrac{1}{f}=\dfrac{1}{.25}=4D$$

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Human Eye and Colourful World Test - 25

Result

Human Eye and Colourful World Test - 25

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SHARING IS CARING

Question 1

Vitreous fluid helps to maintain the shape of the retina

Crystalline eye lens helps in focusing the image

Aqueous humour helps to maintain the pressure in the eye

All of the above

Solution

Question 2

$$3$$

$$4$$

$$2$$

$$1$$

Solution

Question 3

O, Y, Z and N,

P, Y, M and Z,

O, X, M and Z

P, X, Z and N

Solution

Question 4

+5D

-2D

-0.5D

+2D

Solution

Question 5

The blue light bends more than the red light as the blue light has a longer wavelength.

The red light bends more than the blue light as the red light has a longer wavelength.

The blue light bends more than the red light as the blue light has a shorter wavelength.

The red light bends more than the blue light as the red light has a shorter wavelength.

The red and blue lights bend by the same amount as all colors of light refract equally.

Solution

Question 6

cornea

iris

pupil

retina

Solution

Question 7

Due to persistence of vision

Due to reflection

Due to refraction

Due to deviation

Solution

Question 8

pupil

retina

ciliary muscles

iris

Solution

Question 9

The cornea

The crystalline lens

The vitreous humor

Various surfaces in the eye

Solution

Question 10

4 D

40 D

44 D

400 D

Solution

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