61. Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?
62. Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cm from the optical centre?
63. A colour-blind person cannot
64. Magnifying Glass is basically a
65. A microscope used in pathological laboratories forms
66. Which of the following characteristics of light remains unchanged when light travels from vaccum enters water?
67. To resolve an object in an electron microscope,
68. Which of the following is an example of continous emission spectrum?
69. The atmospheric layer reflecting radio waves is called
70. For a ray of light to suffer total internal reflection it has to pass from :
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