The Human Eye and the Colourful World

18 solved questions from Class 10 Science, each with the full working. Tap any question to see the step-by-step solution.

• 1 List three common causes of eye injuries in daily life and suggest one preventive measure for each cause. medium 3 marks Eye protection
• 2 A myopic person sees distant objects clearly only up to a far point of 50 cm. What is the minimum power of a lens (in dioptres) required to correct his vision so that he can see objects at infinity clearly? Assume a thin lens placed close to the eye. hard 4 marks Correction of myopia
• 3 A hyperopic person can see distant objects clearly but cannot read a newspaper held at 25 cm without glasses. The far point of his eye is at infinity. Calculate the minimum power (in dioptres) of a thin converging lens that should be placed close to the eye to enable him to read at 25 cm. medium 2 marks Correction of hyperopia (numerical)
• 4 Which of the following statements correctly describes the changes that occur in the eye during accommodation for a near object? hard MCQ 3 marks Accommodation mechanism
• 5 A person with a myopic eye can see clearly up to a distance of 1.2 m. What is the nature and power of the lens required to correct this defect of vision? medium 3 marks Correction of myopia using concave lens
• 6 (a) Explain the formation of a rainbow in the atmosphere after a rain shower. State the three optical phenomena involved in sequence. (b) Why does the sun appear visible to us about 2 minutes before the actual sunrise? hard 5 marks Rainbow formation and atmospheric refraction
• 7 Which part of the eye contributes the greatest refractive power? easy MCQ 1 mark Refractive power of eye components
• 8 Explain the formation of a primary and a secondary rainbow after a rain shower, mentioning the optical phenomena involved in each case. hard 4 marks Rainbow formation and secondary rainbow
• 9 Describe what happens to the ciliary muscle, suspensory ligaments and the shape of the lens when the eye focuses on a near object. medium 2 marks Accommodation for near vision
• 10 A monochromatic red light (λ = 600 nm) and violet light (λ = 400 nm) pass through a prism whose apex angle is 30°. The refractive index of the prism for red light is 1.50 and for violet light is 1.55. Assuming small angles, calculate the angular dispersion between the red and violet rays after emerging from the prism. hard 5 marks Dispersion of light by a prism
• 11 What is the primary topic or theoretical principle explored in 'The Human Eye and the Colourful World' (Class 10 SCIENCE)? medium MCQ Chapter Core Principle
• 12 Which key mechanism or analytical rule is highlighted in 'The Human Eye and the Colourful World'? medium MCQ Key Analytical Mechanism
• 13 A monochromatic green light of wavelength 520,nm passes through a triangular prism with apex angle 30°. The refractive index of the prism for this light is 1.52. Assuming small angles, calculate the deviation (in degrees) of the emergent ray from the incident ray. medium 2 marks Prism deviation formula
• 14 Which part of the eye contains the photoreceptor cells responsible for colour vision? easy MCQ 1 mark Photoreceptor location
• 15 Briefly describe how the ciliary muscle, suspensory ligaments and the lens shape change when the eye accommodates for a near object. medium 3 marks Accommodation mechanics
• 16 Describe the process of accommodation in the human eye. Include in your answer: the roles of the ciliary muscle and suspensory ligaments, changes in the shape of the lens, and how these changes affect the focal length of the eye. Use diagrams or equations only if necessary; the explanation should be clear and detailed. hard 3 marks Accommodation mechanism
• 17 A myopic eye has a far point at 0.60 m. A person wants to read a book held at 25 cm from the eye. Determine the power (in dioptres) of a thin converging lens placed close to the eye that will allow clear reading. medium 2 marks Corrective lens calculation for myopia
• 18 A monochromatic green light of wavelength 520 nm passes through a triangular prism with apex angle 30°. The refractive index of the prism for this green light is 1.52. Assuming small angles, calculate: (i) the deviation of the emergent ray from the incident ray in degrees; (ii) the angular dispersion between green (520 nm) and violet (400 nm) rays, where the refractive index for violet light is 1.55. hard 5 marks Prism deviation and dispersion