The change in focal length of an eye-lens is caused by the action of the:
- APupil.
- BRetina.
- ✓Ciliary muscles.
- DIris.
Answer: C.
View full solution →Question types
The Human Eyes And The Colourful World question types
506 questions across 14 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
506
Questions
14
Question groups
5
Question types
01
M.C.Q
51 Q→02Fill in the blank
16 Q→03True-False
3 Q→04[1 Mark Questions]
96 Q→05[2 Mark Questions]
55 Q→06[3 Mark Questions]
27 Q→07[5 marks Questions]
5 Q→08M.C.Q-[Phy-1M]
51 Q→09Fill in the blank [Phy-1M]
16 Q→10True-False [Phy-1M]
3 Q→11Answer the questions.[Phy-1M]
96 Q→12Answer the questions.[Phy-2M]
55 Q→13Answer the questions.[Phy-3M]
27 Q→14Answer the questions.[Phy-5M]
5 Q→Sample Questions
The Human Eyes And The Colourful World questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
The human eye forms the image of an object at its:
- ACornea.
- BIris.
- CPupil.
- ✓Retina.
Answer: D.
View full solution →Which of the following colour of white light has the least wavelength?
- ARed.
- BOrange.
- ✓Violet.
- DBlue.
Answer: C.
View full solution →The animal which does not have eyes that look sideways is:
- AHorse.
- BChicken.
- ✓Lion.
- DFish.
Answer: C.
View full solution →The splitting up of white light into seven colours on passing through a glass prism is called:
- ARefraction.
- BDeflection.
- ✓Dispersion.
- DScattering.
Answer: C.
View full solution →Fill in the following blanks with suitable words:
To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made ____.
To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made ____.
Fill in the following blanks with suitable words:
The iris controls the amount of _____ entering the eye.
The iris controls the amount of _____ entering the eye.
Fill in the following blanks with suitable words:
When light is dim, the pupil becomes _____.
When light is dim, the pupil becomes _____.
Fill in the following blanks with suitable words:
Most of the refraction of light rays entering the eye occurs at the outer surface of the _____.
Most of the refraction of light rays entering the eye occurs at the outer surface of the _____.
Fill in the following blanks with suitable words:
The part of eye which alters the size of the pupil is ______.
The part of eye which alters the size of the pupil is ______.
State whether the following statements are true or false:
- The scattering away of red light makes the sky appear blue during the day time.
- The scattering away of blue light makes the sun appear red at sunset.
State whether the following statement is true or false:
Rabbit has eyes which look sideways.
Rabbit has eyes which look sideways.
State whether the following statement is true or false:
The planets twinkle at night due to atmospheric refraction of light.
The planets twinkle at night due to atmospheric refraction of light.
What kind of lens is present in the human eye?
Give the scientific names of the following parts of the eye:
A hole in the middle of the iris.
A hole in the middle of the iris.
Name some everyday objects:
which absorb all the colours in sunlight.
which absorb all the colours in sunlight.
Name one defect of vision (or eye) which cannot be corrected by any type of spectacle lenses.
What type of lens is used to correct:
- Hypermetropia?
- Myopia?
What are the advantages of having two eyes instead of just one?
Complete the following statements:
When the sun is setting, the light from it has to travel a ____ thickness of the earth's atmosphere and only ____ wavelength _____ light is able to reach us. Sunset is therefore ___.
When the sun is setting, the light from it has to travel a ____ thickness of the earth's atmosphere and only ____ wavelength _____ light is able to reach us. Sunset is therefore ___.
What is spectrum? What is the name of glass shape used to produce a spectrum?
What shape are your eye-lenses:
- When you look at your hand?
- When you look at a distant tree?
Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning
of the eye?
of the eye?
A student claims that because of atmospheric refraction, the sun can be seen after it has set, and the day is, therefore, longer than if the earth had no atmosphere.
- What does the student mean by saying that the sun can be seen after it has set?
- Do you think that the students conclusion is correct?
A person suffering from the eye-defect myopia (short-sightedness) can see clearly only up to a distance of 2 metres. What is the nature and power of lens required to rectify this defect?
Explain with the help of labelled ray diagram, the defect of vision called myopia and how it is corrected by a lens.
In the figure given alongside, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum YX on the screen:
State the colour seen.
State the colour seen.
- At X, and
- At Y
- violet.
- Red
- Why do different colours of white light bend through different angles with respect to the incident beam of light?
Explain why, the planets do not twinkle at night?
Explain the functions of the following parts of the eye:
- Iris.
- Pupil.
- Ciliary.
- Muscles.
- Eye-lens.
- Retina.
- Optic nerve.
The descriptions of five kinds of images are given below:
- Diminished and virtual.
- Enlarged and real.
- Enlarged and erect.
- Real and inverted.
- Virtual and the same size.
- On the retina of the eye?
- By a magnifying glass?
- By a convex driving mirror on a car?
- By a plane mirror?
- on the screen of a slide projector?
What is short-sightedness? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show:
- The eye-defect short-sightedness.
- Correction of short-sightedness by using a lens.
What is long-sightedness? State the two causes of long-sightedness (or hypermetropia). With the help of ray diagrams, show:
- The eye-defect long-sightedness.
- Correction of long-sightedness by using a lens.
Differentiate between myopia and hypermetropia. What type of spectacles should be worn by a person having the defects of myopia as well as hypermetropia? How does it help?
With both eyes open, a person's field of view is about:
- 90°
- 50°
- 180°
- 360°
Which of the following is not caused by the atmospheric refraction of light?
- Twinkling of stars at night.
- Sun appearing higher in the sky than it actually is.
- Sun becoming visible two minutes before actual sunrise.
- Sun appearing red at sunset.
Which of the following controls the amount of light entering the eye?
- Ciliary muscles.
- Lens.
- Iris.
- Cornea.
Which of the following colour of white light is least deviated by the prism?
- Green.
- Violet.
- Indigo.
- Yellow.
Which of the following colour of white light has the least wavelength?
- Red.
- Orange.
- Violet.
- Blue.
Fill in the following blanks with suitable words:
When light is dim, the pupil becomes _____.
When light is dim, the pupil becomes _____.
Fill in the following blanks with suitable words:
We can see the sun about _____ minutes before the actual sunrise and about ______ minutes after the actual sunset because of atmospheric _____.
We can see the sun about _____ minutes before the actual sunrise and about ______ minutes after the actual sunset because of atmospheric _____.
Fill in the following blanks with suitable words:
To bring light from a near object to a focus on the retina of the eye, the convex eye-lens needs to be made ____.
To bring light from a near object to a focus on the retina of the eye, the convex eye-lens needs to be made ____.
Fill in the following blanks with suitable words:
To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made ____.
To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made ____.
Fill in the following blanks with suitable words:
The part of eye which alters the size of the pupil is ______.
The part of eye which alters the size of the pupil is ______.
State whether the following statements are true or false:
- The scattering away of red light makes the sky appear blue during the day time.
- The scattering away of blue light makes the sun appear red at sunset.
State whether the following statement is true or false:
The planets twinkle at night due to atmospheric refraction of light.
The planets twinkle at night due to atmospheric refraction of light.
State whether the following statement is true or false:
Rabbit has eyes which look sideways.
Rabbit has eyes which look sideways.
Why do you not see a spectrum of colours when light passes through a flat pane of glass?
Which phenomenon makes us see the sun:
- A few minutes before actual sunrise?
- A few minutes after actual sunset?
Which part of the eye contains cells which are sensitive to light?
Which of the two is scattered more easily: light of shorter wavelengths or light of longer wavelengths?
Which of the following have a wider field of view?
- Animals having two eyes on the opposite sides of their head.
- Animals having two eyes at the front of their head.
Your friend can read a book perfectly well but cannot read the writing on blackboard unless she sits on the front row in class.
- Is she short-sighted or long-sighted?
- What type of lenses-converging or diverging-would an optician prescribe for her?
Why is a normal eye not able to see clearly the objects placed closer than 25cm?
Why do stars seem higher than they actually are? Illustrate your answer with the help of a diagram.
Why does the sun appear red at sunset?
Why does the sun appear red at sunrise?
Why do stars twinkle on a clear night?
When is a person said to have developed cataract in his eye ? How is the vision of a person having cataract restored?
When is a person said to have developed cataract in his eye ? How is the vision of a person
having cataract restored?
having cataract restored?
What is meant by dispersion of white light? Describe the formation of rainbow in the sky with the help of a diagram.
What is a rainbow? What are the two conditions necessary for the formation of a rainbow in the sky?
What is short-sightedness? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show:
- The eye-defect short-sightedness.
- Correction of short-sightedness by using a lens.
What is long-sightedness? State the two causes of long-sightedness (or hypermetropia). With the help of ray diagrams, show:
- The eye-defect long-sightedness.
- Correction of long-sightedness by using a lens.
The descriptions of five kinds of images are given below:
- Diminished and virtual.
- Enlarged and real.
- Enlarged and erect.
- Real and inverted.
- Virtual and the same size.
- On the retina of the eye?
- By a magnifying glass?
- By a convex driving mirror on a car?
- By a plane mirror?
- on the screen of a slide projector?
Explain the functions of the following parts of the eye:
- Iris.
- Pupil.
- Ciliary.
- Muscles.
- Eye-lens.
- Retina.
- Optic nerve.
Differentiate between myopia and hypermetropia. What type of spectacles should be worn by a person having the defects of myopia as well as hypermetropia? How does it help?
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