The Human Eye and Colourful World (Class 10 Science)
The human eye is a complex optical instrument that allows us to see the world. Understanding its structure and function helps explain vision and optical ph
TL;DR: The human eye is a complex optical instrument that allows us to see the world. Understanding its structure and function helps explain vision and optic…
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The human eye is a complex optical instrument that allows us to see the world. Understanding its structure and function helps explain vision and optical ph
The Human Eye and Colourful World MCQs with Answers & Explanations
Q1. Which part of the eye acts as a lens?
- Lens ✓ (correct)
- Retina
- Iris
- Cornea
Explanation: The lens changes shape to focus light rays on the retina, enabling clear vision at different distances.
Q2. What is the function of the iris?
- Detect light
- Control pupil size ✓ (correct)
- Transmit light
- Focus light
Explanation: The iris controls the size of the pupil to regulate the amount of light entering the eye.
Q3. Which part of the eye is sensitive to light?
- Lens
- Sclera
- Retina ✓ (correct)
- Cornea
Explanation: The retina contains photoreceptor cells (rods and cones) that detect light and convert it to electrical signals.
Q4. What does the ciliary muscle control?
- Pupil dilation
- Iris opening
- Tear production
- Lens shape ✓ (correct)
Explanation: Ciliary muscles change the shape of the lens for accommodation, allowing the eye to focus on objects at different distances.
Q5. Near-sightedness is also called:
- Myopia ✓ (correct)
- Astigmatism
- Hyperopia
- Presbyopia
Explanation: Myopia is when the eyeball is too long or cornea too curved, causing distant objects to appear blurred.
Q6. Which type of lens is used to correct myopia?
- Convex lens
- Concave lens ✓ (correct)
- No lens
- Cylindrical lens
Explanation: Concave lenses diverge light rays to correct myopia by moving the focal point back onto the retina.
Q7. What is the normal near point of the human eye?
- 10 cm
- 15 cm
- 25 cm ✓ (correct)
- 50 cm
Explanation: The near point is 25 cm, the closest distance at which the eye can focus clearly without strain.
Q8. Which colour of light has the longest wavelength in visible spectrum?
- Green
- Violet
- Blue
- Red ✓ (correct)
Explanation: Red light has the longest wavelength (approximately 700 nm) in the visible spectrum.
Q9. What is dispersion of light?
- Splitting of white light into colors ✓ (correct)
- Bending of light
- Reflection of light
- Scattering of light
Explanation: Dispersion is the separation of white light into its constituent colors due to different refractive indices for each wavelength.
Q10. Who discovered the spectrum of white light using a prism?
- Young
- Isaac Newton ✓ (correct)
- Huygens
- Galileo
Explanation: Isaac Newton demonstrated that white light is composed of different colors using a glass prism.
Frequently Asked Questions
What is accommodation in the human eye?
Accommodation is the ability of the eye to change the focal length of the lens to focus on objects at varying distances. This is achieved by the ciliary muscles changing the shape of the lens.
What causes a rainbow to form?
A rainbow forms due to dispersion and reflection of sunlight in water droplets. White sunlight enters the droplet, gets dispersed into colors, reflects internally, and exits as separate colored rays.
More Class 10 Science MCQs
- Light Reflection and Refraction
- Electricity
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
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