10. A Lens of Power of -2.5 D, Then its focal length will be :
(a) 0.4 m
(b) -0.4 m
(c) 0.2 m
(d) -0.2 m
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Ray Optics » Exercise - 111. Two thin lens of Power +5 D and -2 D are put in contact with each other. Focal length of the combination is : (a) + 3 m (b) 0.33 m (c) -3 m (d) -0.33 m- Ray Optics » Exercise - 15. A concave mirror has radius of curvature of 0.2 m its focal length is : (a) -0.2 m (b) -0.1 m (c) 0.1 m (d) 0.2 m
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- Ray Optics » Exercise - 14. The focal length (t) of a spherical mirror if radius of curvature R is : (a) R/2 (b) R (c) 3/2 R (d) 2 R
- Ray Optics » Exercise - 18. The magnifying power of an telescope can be increased by using : (a) Eye lens of large focal length (b) Objective of large focal length (c) Objective of short focal length (d) None of these