# Thin Lenses

1. Which of the following statements about short sightedness is CORRECT?

Question 1 of 40

2. What is the name of the rays which are far away from the principal axis?

Question 2 of 40

3. A lens can be considered as an assembly of prisms where each prism refracts light?

Question 3 of 40

4. What does broken lines represent in a ray diagram?

Question 4 of 40

5. The point of convergence or divergence of rays of light is called?

Question 5 of 40

6. Which of the following statements is TRUE about Lenses?

Question 6 of 40

7. What is the plane perpendicular to the principal axis and passing through the principal focus F?

Question 7 of 40

8. M = (height of image)/(height of object ) =(image distance )/(object distance ) =(v )/(u )

Question 8 of 40

9. Differentiate between a convex and a concave lens

Question 9 of 40

10. The point on the principal axis midway between the lens surface and the principle focus is called?

Question 10 of 40

11. Give the SI UNIT of the power of a lens

Question 11 of 40

12. Give the application of lenses?

Question 12 of 40

13. What is the name of the rays which are close and parallel to the principal axis?

Question 13 of 40

14. Which of the following is not among the differences between the eye and the camera?

Question 14 of 40

15. Name the characteristics of images formed by a converging lens when the object is beyond 2F?

Question 15 of 40

16. How do you correct short sightedness?

Question 16 of 40

17. For a diverging lens the principal focus is?

Question 17 of 40

18. What does full lines represent in a ray diagram?

Question 18 of 40

19. Explain the working principle of a lens

Question 19 of 40

20. For a converging lens the principal focus is?

Question 20 of 40

21. Give the relationship between magnification and focal length?

Question 21 of 40

22. Which of the following statements about long sightedness is CORRECT?

Question 22 of 40

23. Name the characteristics of images formed by a converging lens when object between F and 2F?

Question 23 of 40

24. Which eye defect is caused by either the eye lens having a long focal length or the eye ball distance being too short?

Question 24 of 40

25. How do you correct long sightedness?

Question 25 of 40

26. Give the Lens formula for both converging and diverging Lens?

Question 26 of 40

27. Name the characteristics of images formed by a diverging lens?

Question 27 of 40

28. Mention the 2 methods of determining the focal length of a converging lens?

Question 28 of 40

29. Mention the position of the principal focus when rays of light meet a convex lens?

Question 29 of 40

30. The imaginary lines passing through the center of curvature is called?

Question 30 of 40

31. Give the 2 impairments in human eye vision due to lens defects?

Question 31 of 40

32. LINEAR MAGNIFICATION M = image distance/ object distance

Question 32 of 40

33. The power of lens = (1 )/(focal length in meters ) = 1 / f(m)

Question 33 of 40

34. What is the distance between the optical center and the principal focus?

Question 34 of 40

35. The radius of the sphere of which the surface of the lens is part of is called?

Question 35 of 40

36. The center of the sphere of which the surface of the lens is part of is called?

Question 36 of 40

37. Mention the 2 types of common lenses?

Question 37 of 40

38. What is the ratio of the height of image to the height of object called?

Question 38 of 40

39. Name the characteristics of images formed by a converging lens when object is between F and lens?

Question 39 of 40

40. Name the characteristics of images formed by a converging lens when object is at F?

Question 40 of 40