31. A light beam that appears at the main focus of a concave lens will emit after refraction.
32. The focal length of a spherical mirror is . . . . . . . .
33. Two glass lenses of same focal length, one being convex and the other concave, are kept in contact, the combination will act as
34. Which of the following does not used concave mirror?
35. The theory belongs behind stars twinkling is that-
36. Persons suffering from myopia are advised to use
37. The characteristics of an image form by a plane mirror are:
38. In which case a incident ray and reflected ray are all on the same surface?
39. The center of the reflecting surface of a spherical mirror of a point called.
40. Which one of the following energy conversions takes place in carrying out the process of photosynthesis?
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