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617, , CHAPTER 6: Optics, , 3. The focal length of a plane mirror is =, , (a) infinite (b) zero (c) 1 : (d) none of these, 4. A200 cm tall man can see his full image in a plane mirror of minimum length, (a) 50 cm (b) 125 cm (c) 200 cm (d) 100 cm, 5. Aplane mirror reflects a beam of light to form a real image. The incident beam is, (a) parallel (b) divergent (c) convergent (d) any one of these {MP PMT], 6. A plane mirror is approaching you at 10 cm/sec. You can see your image in it. The image will approach you with a, speed, (a) 5 cm/s (b) 10 cm/s (c) 15 cm/s (d) 20 cm/s [CPMT, 7. A ray of light is incident on a plane mirror at an angle i. The reflected ray deviates by an angle, (a) 2i (b) i (c) 180 -2i (d) 90 -i, 8. An object is kept symmetrically between two plane mirrors inclined at an angle of 60°. The number of image, rosa i = a inte, ORI a) \ | Ge (c) 8 (d) infinite, , a eee : The number of images formed is, (a ek es ors. e nu :, a arvalle| mirr (d) infinite [CPM