Light
Q.1. What makes things visible?
Q.2. Name some luminous objects.
Q.3. Name some non-luminous objects.
Q.4. What is reflection of light?
Q.5. Describe
Incident Ray
Reflected Ray
Point of Incidence
Normal
Angle of Incidence
Angle of Reflection
Q.6. What are the laws of reflection?
Q.7. What happens when the incident ray is normal to the plane of the mirror?
Q.8. What happens when the angle of incidence is 45o?
Q.9. What is regular reflection? Give its other name.
Q.10. What is irregular reflection? Give its other name.
Q.11. What kind of image is formed by the plane mirror?
Q.12. What are the characteristics of an image formed by a plane mirror?
Q.13. What are multiple reflections?
Q.14. If two mirrors make an angle θ between them and the object is placed in between the two mirrors and the number of images is n then what is the relation between n and θ?
Q.15. What is a periscope?
Q.16. Periscope works on what principle?
Q.17. What is a Kaleidoscope?
Q.18. How does a Kaleidoscope work?
Q.19. What is dispersion of light?
Q.20. Name the seven colors found in the dispersion of light?
Q.21. Who first observed dispersion?
Q.22. Which colored light deviates the most?
Q.23. Which colored light deviates the least?
Q.24. Name a natural phenomenon showing dispersion.
Q.25. What are eyes?
Q.26. Explain the structure of the eye?
Q.27. What is a blind spot in the eye?
Q.28. The image persists on the retina for how many seconds?
Q.29. How is an object perceived as moving by our eye?
Q.30. What is myopia? What is the other name for it?
Q.31. How can myopia be removed?
Q.32. What is a hypermetropia? What is the other name for it?
Q.33. How can hypermetropia be removed?
Q.34. What is a cataract? How can it be cured?
Q.35. How can we take proper care of our eyes?
Q.36. What is a braille system?
Q.37. Who was Louis Braille?
Q.38. Describe the Braille System?
Q.39. Give an account of different personalities who achieved in different fields even being blind?
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