Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 60

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Weekly Quiz Competition

Question 1
1 / -0

Focal length of eye lens is changes by.

A
Pupil

B
Iris

C
Cornea

D
Ciliary muscles

Solution

The curvature of eye lens is responsible for the focal length of the eye, this curvature can be changed by ciliary muscles present in the eyes. There relaxation and contraction helps in changing the curvature.
Question 2
1 / -0

Which of the following phenomena cannot be explained by scattering of light?

A
Blue colour of sky

B
White colour of clouds

C
Tyndall effect

D
Formation of rainbow

Solution
Question 3
1 / -0

A person can see clearly objects between 15 and 100 cm from his eye. The range of his vision if he wears close fittings spectacles having a power of $$0.8$$ dipole is

A
$$5$$ to $$500cm$$

B
$$12$$ to $$250cm$$

C
$$17$$ to $$500cm$$

D
$$17$$ to $$250cm$$

Solution

If he wears glass with power of-0.8 , then he would have residual -0.20D of myopia for distance and for near he would be able to see with the equivalent of -5.87D of myopia. This translates to range of clear vision with those glasses from 1/0.2=5 meters to 1/5.87=0.17 meters i.e. 17cm to 500cm.
Question 4
1 / -0

A large-angle prism deviates a light ray

A
more

B
less

C
equal to a small-angle prism

D
does not deviate at all

Solution

Let, $$i=\text{angle of incidence}$$, $$e=\text{angle of emergence}$$ and $$A=\text{angle of prism}$$

$$ \begin{array}{l} \text { We know for prism, deviation } \\ \qquad \delta=i+e-A \\ \text { If } A \text { is large } \delta \text { is less by this equation } \\ \text { so option (B) less is the right option } \end{array} $$
Question 5
1 / -0

Ocean appears blue due to _____________________.

A
Greater depth

B
Scattering of light by water particles

C
Blue colour of water

D
None of these

Solution

The ocean appears blue due to the scattering of light by water particles. When sunlight passes through the atmosphere, the fine particles in the air scatter the blue color (shorter wavelengths) more strongly than red.
Question 6
1 / -0

Which defect of vision of eye is shown respectively?

A
P: Presbyopia, Q: Near sightedness

B
P: Far sightedness, Q: Near sightedness

C
P: Near sightedness, Q: Far sightedness

D
P: Presbyopia, Q: Far sightedness

Solution

$$P:-$$

In this we see that the eye can't see the nearby objects as the lens can't focus the image on the retina but focuses the image beyond the retina.

This defect of the eye is called $$far-sightedness$$ as the eye in this defect can't see the nearby objects but can see far-off objects.

$$Q:-$$

In this we see that the eye can't see the far off objects clearly as the lens can't focus the image on the retina but focuses the image before the retina.

This defect of the eye is called $$near-sightedness$$ as the eye in this defect can't see the far away objects but can see nearbyf objects.

Answer-(B)
Question 7
1 / -0

In the experiment of prism incident red color ray instead of white light through a prism. Which color band will you observe on screen?

A
Red colour spectrum

B
All the colours of rainbow

C
Maroon and yellow colour spectrum

D
White colour spectrum

Solution

Prism basically split the incident white light or any mixture of different wavelength because of different refractive indexes and hence different deviation of different wavelengths of light.
When the red colour of light is incident on the prism, the band obtained on the screen constitutes the wavelengths that made up the red colour.
And, those wavelengths obtained on the screen are red in colour as they are all of the red colours and are called red color spectrum.

Question 8

1 / -0

Match the column I with column II and select the correct option from the codes given below.

	Column I		Column II
(a)	Choroid	(i)	Detects light stimulus
(b)	Retina	(ii)	Absorbs light and prevent it from being reflected within the eyeball
(c)	Cornea	(iii)	Controls the size of the pupil
(d)	Iris	(iv)	Helps to focus light as it enters the eye.

(a)-(ii). (b)-(i), (c)-(iv), (d)-(iii)

(a)-(i), (b)-(ii), (c)-(iii). (d)-(iv)

(a)-(ii). (b)-(iii), (c)-(iv), (d)-(i)

(a)-(iii), (b)-(iv), (c)-(i), (d)-(iii)

Solution

Question 9
1 / -0

The near point of a hypermetropic person is 75 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the eye?

A
$$1\ D$$

B
$$1.5\ D$$

C
$$0.75\ D$$

D
$$2.67\ D$$

Solution
Question 10
1 / -0

The near point of a person is $$75cm$$. In order that he may be able to read book at a distance $$25cm$$. The power of spectacles lenses should be

A
$$-2D$$

B
$$+3.75D$$

C
$$+2.6D$$

D
$$+3D$$

Solution

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Re-Attempt Weekly Quiz Competition

Human Eye and Colourful World Test - 60

Result

Human Eye and Colourful World Test - 60

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SHARING IS CARING

Question 1

Pupil

Iris

Cornea

Ciliary muscles

Solution

Question 2

Blue colour of sky

White colour of clouds

Tyndall effect

Formation of rainbow

Solution

Question 3

$$5$$ to $$500cm$$

$$12$$ to $$250cm$$

$$17$$ to $$500cm$$

$$17$$ to $$250cm$$

Solution

Question 4

more

less

equal to a small-angle prism

does not deviate at all

Solution

Question 5

Greater depth

Scattering of light by water particles

Blue colour of water

None of these

Solution

Question 6

P: Presbyopia, Q: Near sightedness

P: Far sightedness, Q: Near sightedness

P: Near sightedness, Q: Far sightedness

P: Presbyopia, Q: Far sightedness

Solution

Question 7

Red colour spectrum

All the colours of rainbow

Maroon and yellow colour spectrum

White colour spectrum

Solution

Question 8

(a)-(ii). (b)-(i), (c)-(iv), (d)-(iii)

(a)-(i), (b)-(ii), (c)-(iii). (d)-(iv)

(a)-(ii). (b)-(iii), (c)-(iv), (d)-(i)

(a)-(iii), (b)-(iv), (c)-(i), (d)-(iii)

Solution

Question 9

$$1\ D$$

$$1.5\ D$$

$$0.75\ D$$

$$2.67\ D$$

Solution

Question 10

$$-2D$$

$$+3.75D$$

$$+2.6D$$

$$+3D$$

Solution

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