Set 2: Vision Defects, Correction, and Optical Phenomena
Introduction: This set focuses on common vision defects, their causes, corrections, and various optical phenomena related to light such as scattering, refraction in the atmosphere, and the human eye's response to different light conditions.
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PHYSICS | Human Eye-B
📝 Questions: 50
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Q1. A student is having difficulty reading the blackboard from the back of the class but can read a book clearly. Which defect might they have?
Q2. Why are the lenses of diving goggles curved and not flat?
Q3. A truck driver prefers to use yellow-tinted glasses at night. Why might this help?
Q4. Why do traffic stop signs use red as the primary colour?
Q5. A fisherman sees a fish in the water. To spear it accurately, should he aim directly at the fish, above it, or below it?
Q6. Why do many emergency vehicles often have the word "AMBULANCE" written in reverse on the front?
Q7. An elderly person needs to hold a menu at arm's length to read it clearly. What is the most likely reason?
Q8. Why are car headlights designed with a parabolic reflector behind the bulb?
Q9. Why does a pencil look bent when placed in a glass of water?
Q10. A person who works long hours on a computer frequently experiences eye strain. What is a simple practice to reduce this?
Q11. Why are safety goggles important for someone working with welding equipment?
Q12. Why do we often see a "glint" or bright spot in a person's eye in a photograph?
Q13. Why does the sun look much larger near the horizon at sunrise/sunset than at noon?
Q14. Why are concave mirrors used in makeup/shaving mirrors?
Q15. After being in a dark movie theater, why is it hard to see when you first walk out into bright sunlight?
Q16. Why do wet roads sometimes appear darker than dry roads?
Q17. Why do we blink our eyes?
Q18. A lifeguard at a pool is trying to locate a struggling swimmer at night. Why might it be harder to see them under pool lights?
Q19. A person with normal vision gets reading glasses. What will happen if they try to look at a distant mountain while wearing them?
Q20. Why do periscopes in submarines often use a combination of prisms instead of mirrors?
Q21. Why do high-quality cameras and telescopes often have very large lenses or mirrors?
Q22. Why does a cut diamond sparkle with different colours?
Q23. A person feels their eyes are dry and vision is slightly blurry after a long flight. What is a likely cause?
Q24. Why are blue or green screens used in movie special effects (chroma key)?
Q25. A rainbow is always seen with the sun behind you. Why?
Q26. Why do streetlights often appear to have a starburst or halo effect in a rainy photograph?
Q27. Why do some people need to wear different glasses for driving and reading?
Q28. Why does a spoon handle look broken at the water's surface in a glass?
Q29. Why is it dangerous to look directly at the sun, especially during a partial solar eclipse?
Q30. A person sees "floaters" – tiny specks drifting in their field of vision. What are these usually?
Q31. Why are rear-view mirrors in cars often have a "day/night" flipping lever?
Q32. A mirage of a pool of water on a hot road is caused by:
Q33. Why are lighthouse beams often designed to rotate?
Q34. Why do your eyes sometimes feel tired after trying to read in a moving vehicle?
Q35. Why does a white shirt look white under both sunlight and fluorescent light?
Q36. A person who has had cataract surgery (lens replacement) often needs reading glasses afterward. Why?
Q37. Why do 3D movies require you to wear special glasses?
Q38. Why does a peacock's feather appear to change colour when viewed from different angles?
Q39. A pilot flying at high altitude sees a darker blue sky above and a lighter blue near the horizon. Why?
Q40. Why is it easier to read black text on a white background than white text on a black background for long periods?
Q41. A cook uses a glass lid to check on boiling pasta without lifting it. Why does the lid get foggy with droplets, making it hard to see?
Q42. Why do some people see halos around streetlights at night, especially after certain eye surgeries or with cataracts?
Q43. A photographer uses a polarizing filter to take a picture of a landscape with a blue sky. What does it do?
Q44. Why does a room look darker when you turn off a bright overhead light, even if there is still light from a window?
Q45. A person with one functional eye can still judge distances fairly well by moving their head. How does this work?
Q46. Why are the letters on a hospital patient's chart (Snellen chart) black on white?
Q47. A magician appears to "saw a person in half" using angled mirrors. What principle makes this illusion work?
Q48. Why do virtual reality (VR) headsets sometimes cause motion sickness or eye strain?
Q49. A person looks at their reflection in the curved side of a shiny spoon. Their reflection is upside down. Which side of the spoon are they looking into?
Q50. A barber places a large mirror on the wall in front of you and a smaller mirror behind you, allowing you to see the back of your head. How does this work?
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