Human Eye And Colourful World Test

Result

Human Eye And Colourful World Test - 1

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Question 1
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What is the increasing order of the extent of angle changes undergone by the colours of the spectrum during splitting of white light?

A
Red < Yellow < Blue

B
Yellow < Blue < Red

C
Red < Blue < Yellow

D
Blue < Yellow < Red

Solution

The refractive index of the medium depends upon the wavelength of the light. The greater is the wavelength, the lesser is the refractive index, hence lesser deviation. The wavelength of red colour is maximum, followed by yellow, and blue colour has the least wavelength.

Hence, red colour will form the least angle, followed by yellow, and the angle made by the blue with the direction of the incident ray will be maximum.
Question 2
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_______ is the dark muscular diaphragm that controls the size of the pupil.

A
Aqueous humour

B
Ciliary muscle

C
Cornea

D
Iris

Solution

Iris controls the size of the pupil.

Iris is a pigmented muscular curtain near the front of the eye, between the cornea and the lens. The iris is located in front of the lens and ciliary body and behind the cornea. The iris consists of two sheets of smooth muscle with contrary actions: dilation (expansion) and contraction (constriction). These muscles control the size of the pupil and thus determine how much light reaches the sensory tissue of the retina.
Question 3
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Which of the following defects can be rectified by using cylindrical lenses?

A
Myopia

B
Presbyopia

C
Astigmatism

D
Hypermetropia

Solution

Astigmatism, in which cornea has an abnormal curvature, can be rectified by cylindrical lenses.
Question 4
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Formation of rainbow is due to

A
dispersion

B
scattering

C
atmospheric refraction

D
total internal reflection

Solution

Water droplets in the atmosphere behave as tiny prisms. When white light enters the water droplets, it splits into its constituent colours due to dispersion whereas total internal reflection takes place at the rear surface of the water droplet. Hence, we can conclude that the formation of rainbow is due to atmospheric refraction.
Question 5
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 change in focal length of an eye lens is caused by the action of ciliary muscles.