Human Eye and Colourful World MCQs | Human Eye and Colourful World Multiple Choice Questions and Answers
Questions
1
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
Answer: ─0.5 D
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3
Twinkling of stars is due to atmospheric
Answer: refraction of light by different layers of varying refractive indices
4
The clear sky appears blue, because
Answer: violet and blue lights get scattered more than lights of all other colours by the atmosphere
5
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
Answer: is scattered the least by smoke or fog
7
When light rays enter the eye, most of the refraction occurs at the
Answer: outer surface of the cornea
8
Which of the following statements is correct?
Answer: A person with myopia can see nearby objects clearly
9
The change in the focal length of human eye is caused due to
Answer: Ciliary muscles
10
The least distance of distinct vision for a young adult with normal vision is
Answer: 25 cm
12
The part of the eyes refracts light entering the eye from external objects?
Answer: Cornea
13
When we enter a cinema hall, we cannot see properly for a short time. This is because-
Answer: Adjustment of size of pupil takes some time
15
A concave lens of suitable focal length is used for correcting a-
Answer: Myopic eye
17
Which colour suffers least deviation on passing through a prism?
Answer: Red
19
A human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to –
Answer: Accommodation
20
The change of focal length of an eye lens to focus the image of objects at varying distances is done by the action of the -
Answer: Ciliary muscles
