Bihar Board Class 10 · Science · Matric exam 2027
Chapter 11: The Human Eye and the Colourful World
This chapter’s questions from Bihar Board (BSEB)’s real papers of 2021–2026 — the 20 asked most often, 3 with the full model answer, 17 with how the answer begins — and objective questions with the board’s key.
- marks a year (about)
- 5
- questions a year (about)
- 6
- rank in Science
- #7
From 6 years of papers, 2021–2026 · full chapter-wise marks
VVI questions — the ones the board asked most (20)
- Q1Short answer2 marksAsked: 2022, 2023, 2026
What is defect of vision ? How many types of it are there ?
Medha Ma’am
AskMedha’s AI teacher
Model answer · defects of vision, types
- 1.Defect of vision is the condition in which the eye may gradually lose its power of accommodation, so that the person cannot see the objects distinctly and comfortably. The vision becomes blurred due to the refractive defects of the eye.1 mark
- 2.There are mainly three common refractive defects of vision. These are (i) myopia or near-sightedness, (ii) Hypermetropia or far-sightedness, and (iii) Presbyopia. These defects can be corrected by the use of suitable spherical lenses.1 mark
- Write that the eye loses its power of accommodation and vision becomes blurred due to refractive defects of the eye.
- Name all three types exactly: myopia, hypermetropia and presbyopia.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
- Q2Short answer2 marksAsked: 2021, 2025
What is farsightedness?
Medha Ma’am
AskMedha’s AI teacher
Model answer · hypermetropia (far-sightedness)
- 1.Hypermetropia is also known as far-sightedness. It is a vision defect in which a person can see distant objects clearly but cannot see nearby objects distinctly.1 mark
- 2.In this defect, the near point of the person is farther away from the normal near point of 25 cm, so the person has to keep reading material much beyond 25 cm from the eye for comfortable reading.1 mark
- Write the term 'Hypermetropia' and its synonym 'far-sightedness' at the start.
- State clearly that distant objects are seen clearly but nearby objects are not.
- Mention that the near point shifts farther than the normal near point of 25 cm.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
- Q3Long answer6 marksAsked: 2025
What are defects of vision ? What are their types ? How are the defects resolved ?
Medha Ma’am
AskMedha’s AI teacher
Model answer · defects of vision, correction
- 1.A vision defect is a condition in which the eyes are unable to see objects clearly. Sometimes, the eye may gradually lose its power of accommodation, and in such conditions, the person cannot see the objects distinctly and comfortably. The vision becomes blurred due to the refractive defects of the eye.1 mark
- 2.Vision defects are mainly of three types: myopia, hypermetropia, and presbyopia. Myopia is also known as near-sightedness, in which a person can see nearby objects clearly but cannot see distant objects distinctly, because the image of a distant object is formed in front of the retina. This defect may arise due to excessive curvature of the eye lens, or elongation of the eyeball. Hypermetropia is also known as far-sightedness, in which a person can see distant objects clearly but cannot see nearby objects distinctly, because the light rays from a closeby object are focussed at a point behind the retina. This defect arises either because the focal length of the eye lens is too long, or the eyeball has become too small. Presbyopia is a defect in which the power of accommodation of the eye decreases with ageing, so that the near point gradually recedes away and the person finds it difficult to see nearby objects comfortably and distinctly. It arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens.1.5 marks
- 3.Myopia is corrected by using spectacles with a concave lens of suitable power. A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.1.5 marks
- 4.Hypermetropia is corrected by using spectacles with a convex lens of appropriate power. Eye-glasses with converging lenses provide the additional focussing power required for forming the image on the retina.1 mark
- 5.Presbyopia is corrected by using spectacles with bifocal lenses. A common type of bi-focal lenses consists of both concave and convex lenses. The upper portion consists of a concave lens, which facilitates distant vision, while the lower part is a convex lens, which facilitates near vision.1 mark
Diagram: Draw three eye diagrams side by side: (1) myopic eye showing the image O formed in front of the retina, labelled 'Myopic Eye'; (2) correction for myopia showing a concave lens placed before the eye bringing the image O back onto the retina, labelled 'Correction for myopia'; (3) hypermetropic eye showing the image N formed behind the retina, labelled 'Hypermetropic eye', and correction for hypermetropia showing a convex lens bringing the image N onto the retina, labelled 'Correction for Hypermetropic eye'.
- Write the words 'myopia', 'hypermetropia' and 'presbyopia' clearly as the three types to earn point 2.
- State explicitly that myopia needs a 'concave lens' and hypermetropia needs a 'convex lens' to earn points 3 and 4.
- Mention 'bifocal lenses' and that they have a concave upper part and convex lower part to earn point 5.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
- Q4Long answer6 marksAsked: 2023
What is the process of accommodation of human eye ? Explain it.
How the model answer begins
1. The ability of the eye lens to adjust its focal length is called accommodation. The eye lens is composed of a fibrous, jelly-like material and its curvature can be modified to some extent by the ciliary muscles. The…
The full answer from Medha Ma’am → - Q5Long answer6 marksAsked: 2022
How will you show by experiment that sunlight consists of seven colours?
How the model answer begins
1. To show that sunlight consists of seven colours, a narrow beam of sunlight is made to fall on one face of a glass prism in a dark room. For this, a small hole or narrow slit is made in a thick cardboard sheet and…
The full answer from Medha Ma’am → - Q6Long answer6 marksAsked: 2021
What do you mean by dispersion of light ? Explain the rainbow.
How the model answer begins
1. The splitting of white light into its component colours is called dispersion of light. When white light passes through a glass prism, it splits into a band of seven colours called its spectrum. The various colours seen…
The full answer from Medha Ma’am → - Q7Long answer6 marksAsked: 2025
What are defects of vision ? What are their types ? How are the defects resolved ?
How the model answer begins
1. A vision defect is a condition in which the eyes are unable to see objects clearly. Sometimes, the eye may gradually lose its power of accommodation. In such conditions, the person cannot see the objects distinctly and…
The full answer from Medha Ma’am → - Q8Short answer2 marksAsked: 2021
What is the defect of vision in human eye ? Name the types of vision defects.
How the model answer begins
1. When the human eye is unable to form a clear image of an object on the retina, it is called a vision defect. The vision becomes blurred due to the refractive defects of the eye, and the person cannot see the objects…
The full answer from Medha Ma’am → - Q9Short answer2 marksAsked: 2024
What is persistence of vision ?
How the model answer begins
1. The impression of an image formed on the retina persists on the brain for about 1/16th of a second even after the object is removed from the eye.
The full answer from Medha Ma’am → - Q10Short answer2 marksAsked: 2024
Draw a ray diagram to show refraction of ray of light at both the refractive surfaces of a prism placed in air.
How the model answer begins
1. A ray of light PE is incident on the refracting surface AB of the prism at angle of incidence ∠i. It bends towards the normal and travels inside the glass as the refracted ray EF at angle of refraction ∠r, bending…
The full answer from Medha Ma’am → - Q11Short answer2 marksAsked: 2024
What do you mean by power of lens ? Write its SI unit.
How the model answer begins
1. The power of a lens is the measure of the degree of convergence or divergence of light rays falling on it. The power of a lens is defined as the reciprocal of its focal length, that is, P = 1/f.
The full answer from Medha Ma’am → - Q12Short answer2 marksAsked: 2025
Why do planets not twinkle? Explain.
How the model answer begins
1. The planets do not twinkle because the planets are much closer to the earth, and are thus seen as extended sources.
The full answer from Medha Ma’am → - Q13Short answer2 marksAsked: 2025
Write the main differences between stars and planets.
How the model answer begins
1. Stars emit their own light, whereas planets do not produce light — they only reflect the light of stars (the Sun).
The full answer from Medha Ma’am → - Q14Short answer2 marksAsked: 2026
Why is the railway signal light always red in colour ?
How the model answer begins
1. Red colour has a wavelength that is longer among the colours of light, as the red light has a wavelength about 1.8 times greater than blue light.
The full answer from Medha Ma’am → - Q15Short answer2 marksAsked: 2022
Explain scattering of light.
How the model answer begins
1. When light passes through a medium containing fine particles of dust or other substances, the light spreads in all directions.
The full answer from Medha Ma’am → - Q16Short answer2 marksAsked: 2022
Why does the sun appear red at the time of sunrise?
How the model answer begins
1. At the time of sunrise, the Sun is near the horizon. Light from the Sun near the horizon passes through thicker layers of air and larger distance in the earth's atmosphere before reaching our eyes.
The full answer from Medha Ma’am → - Q17Short answer2 marksAsked: 2021
Why do stars twinkle ?
How the model answer begins
1. Stars twinkle due to atmospheric refraction of starlight. The starlight, on entering the earth's atmosphere, undergoes refraction continuously before it reaches the earth, since the atmospheric refraction occurs in a…
The full answer from Medha Ma’am → - Q18Short answer2 marksAsked: 2021
Write two components of sunlight which are not visible to us.
How the model answer begins
1. One component of sunlight which is not visible to us is infrared rays.
The full answer from Medha Ma’am → - Q19Short answer2 marksAsked: 2025
Why do planets not twinkle? Explain.
How the model answer begins
1. Planets do not twinkle because the planets are much closer to the earth, and are thus seen as extended sources. If we consider a planet as a collection of a large number of point-sized sources of light, each point-sized…
The full answer from Medha Ma’am → - Q20Short answer2 marksAsked: 2025
What is farsightedness ?
How the model answer begins
1. Hypermetropia is also known as far-sightedness. It is a vision defect in which a person can see distant objects clearly but cannot see nearby objects distinctly.
The full answer from Medha Ma’am →
Objective questions with the board’s key (10)
- 1. Bihar Board 2026
Which colour of ray in the spectrum has more inclination ?
- (A) Green
- (B) Red
- (C) Violet ✓
- (D) Yellow
Answer: (C)
- 2. Bihar Board 2026
The coloured part of the eye is
- (A) Lens
- (B) Iris ✓
- (C) Retina
- (D) Cornea
Answer: (B)
- 3. Bihar Board 2026
The near point of a normal eye is
- (A) infinity
- (B) 50 cm
- (C) 100 cm
- (D) 25 cm ✓
Answer: (D)
- 4. Bihar Board 2026
The defect in which a person cannot see distant objects clearly is
- (A) Hypermetropia
- (B) Myopia ✓
- (C) Presbyopia
- (D) None of these
Answer: (B)
- 5. Bihar Board 2026
Myopia can be corrected by
- (A) Convex lens
- (B) Concave lens ✓
- (C) Cylindrical lens
- (D) None of these
Answer: (B)
- 6. Bihar Board 2026
The distance between the eye lens and the retina is approximately
- (A) 25 cm
- (B) 1 cm
- (C) 2.5 cm ✓
- (D) 5 cm
Answer: (C)
- 7. Bihar Board 2026
Which type of lens is found in the human eye ?
- (A) Convex ✓
- (B) Concave
- (C) Cylindrical
- (D) Bifocal
Answer: (A)
- 8. Bihar Board 2026
Which of the following lenses is used to correct near sightedness ?
- (A) Concave lens ✓
- (B) Convex lens
- (C) Planoconvex lens
- (D) None of these
Answer: (A)
- 9. Bihar Board 2026
Which colour of light is scattered least in the atmosphere ?
- (A) Red ✓
- (B) Blue
- (C) Yellow
- (D) Green
Answer: (A)
- 10. Bihar Board 2026
Which colour deviates minimum in a glass prism ?
- (A) Red ✓
- (B) Yellow
- (C) Blue
- (D) Violet
Answer: (A)
Questions parents and students ask
- How many marks does "The Human Eye and the Colourful World" carry in Bihar Board Class 10 Science?
- In the Bihar Board papers of 2021–2026, this chapter carried about 5 marks and about 6 questions a year; by marks it ranks 7 in Science.
- Which are the most important (VVI) questions of "The Human Eye and the Colourful World"?
- The 20 questions above are from the board’s real papers, each with the years it was asked; the most-asked come first with their full model answers. All 20 written questions of this chapter, with answers, are in the AskMedha app.
- Do the answers follow the board’s marking scheme?
- BSEB does not publish a marking scheme. Each answer is written point by point on a structure derived from past papers and checked by a second, independent model; it is never called the board’s official scheme.
The same preparation, with Medha Ma’am — on your phone
Every question of every chapter with its model answer, practice questions in the board’s own shapes, 60 minutes of class a day, written answers marked, a test every Sunday and a WhatsApp report to parents.
Medha Ma’am is an AI teacher, not a live tutor. Every answer is checked twice; a person takes responsibility.