21. The distance between the focal point and optic centre is called the ___________.
22. The rays passing parallel to the principal axis converge at the focus in the case of ____________.
23. The rays passing parallel to the principal axis diverge from the focus in the case of ___________ .
24. The ray passing through the focus will take a path parallel to ___________ after refraction.
25. When object is placed beyond the center of curvature (C2), __________ and ___________ image is formed on the principal axis between the points F1 and C1.
26. When an object is placed at the center of curvature (C2) on the principal axis, you will get an image at C1 which is ___________ and the _________ as that of object.
27. When an object is placed between center of curvature (C2) and focus (F2), you will get an image which is __________ and __________ . The image will form beyond C1.
28. As the image formed is ________, we can see it with our eyes.
29. The image is real which we can’t see with our eyes but can be viewed if the image is captured on a ________ .
30. A magnified virtual image is formed on the _________ of the lens where the object is placed.
31. The particular behaviour of convex lens helps to construct a __________ , which gives a magnified image.
32. Lens formula is 
= ________
– 
33. Lens makers formula is, = _____________.
– 
)34. The convex lens behaves as a _________ lens, if it is kept in a medium with refractive index less than the refractive index of the lens.
35. The convex lens behaves like a __________ lens when it is kept in a transparent medium with greater refractive index than that of the lens.
36. An air bubble in water behaves like a ____________ .
37. The rays from the distant object, falling on the convex lens pass through _______.
38. The ray passing through the ________ of the lens is not deviated.
39. The lens which can form real and virtual images is _________ .
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