41. The diamond appears lustrous because of
42. Assertion (A): In a motion picture, usually 24 frames are projected every second over the whole length of the film.
Reason (R): An image formed on the retina of eye persists for about 0.1s after the removal of the stimulus.
Reason (R): An image formed on the retina of eye persists for about 0.1s after the removal of the stimulus.
43. What is the time difference between the actual passing of the sun over the horizon and out being able to see the image of it on earth?
44. When the object is placed at . . . . . . . ., no image will form in the converging lens?
45. The magnification of a mirror must be . . . . . . . . for a virtual and erect image-
46. The focal length of a convex mirror is . . . . . . . .
47. Which colour is formed when Red and Green are mixed?
48. The focal length of a convex lens is 2.5 m. Find its power.
49. To get the real reflection, an object is placed at a distance of 30 cm from a concave mirror with a focal length of 20 cm. What will be the distance of image from mirror?
50. A ray of light when refracted suffers change in velocity. In this context, which one among the following statements is correct?
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