41. Which type of lens is required for correcting the vision of a person with myopia?
42. If an object is placed 10 cm away from a convex mirror of radius of curvature of 5cm what will be its magnification?
43. Consider the following phenomena.
1. Size of the Sun at dusk
2. Colour of the Sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky
Which of the above are optical illusions?
1. Size of the Sun at dusk
2. Colour of the Sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky
Which of the above are optical illusions?
44. To get a diminished, virtual and erect image of a tall building, which mirror is used?
45. Where should an object be placed in front of a convex lens in order to obtain its original size?
46. A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
47. Light travel in a
48. Mirage formation is an example of
49. An electron microscope gives higher magnification than an optical microscope because
50. Which type of image is always formed by a convex mirror?
1. Real
2. Virtual
3. Enlarged
1. Real
2. Virtual
3. Enlarged
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