Thin Lenses

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

Question 1 of 40

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

Question 2 of 40

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

Question 3 of 40

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

Question 4 of 40

5. For a converging lens the principal focus is?

Question 5 of 40

6. Differentiate between a convex and a concave lens

Question 6 of 40

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

Question 7 of 40

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

Question 8 of 40

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

Question 9 of 40

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

Question 10 of 40

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

Question 11 of 40

12. How do you correct long sightedness?

Question 12 of 40

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

Question 13 of 40

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

Question 14 of 40

15. For a diverging lens the principal focus is?

Question 15 of 40

16. Explain the working principle of a lens

Question 16 of 40

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

Question 17 of 40

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

Question 18 of 40

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

Question 19 of 40

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

Question 20 of 40

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

Question 21 of 40

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

Question 22 of 40

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

Question 23 of 40

24. LINEAR MAGNIFICATION M = image distance/ object distance

Question 24 of 40

25. Mention the 2 types of common lenses?

Question 25 of 40

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

Question 26 of 40

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

Question 27 of 40

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

Question 28 of 40

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

Question 29 of 40

30. How do you correct short sightedness?

Question 30 of 40

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

Question 31 of 40

32. Give the relationship between magnification and focal length?

Question 32 of 40

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

Question 33 of 40

34. Give the application of lenses?

Question 34 of 40

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

Question 35 of 40

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

Question 36 of 40

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

Question 37 of 40

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

Question 38 of 40

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

Question 39 of 40

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

Question 40 of 40