11. 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
12. The value of atleast distance of distinct vision is :
(a) 23 cm
(b) 24 cm
(c) 25 cm
(d) 26 cm
13. A plane mirror produced a magnification of :
(a) -1
(b) +1
(c) Zero
(d) Between 0 andinfin;
14. The image formed by an objective of a compound microscope is :
(a) Virtaul and diminished
(b) Real and diminished
(c) Real and enlarge
(d) Virtual and enlarge
15. An object is placed at a distance of 40 cm infront of concave mirror of focal length 20 cm. The image produced ______ .
(a) Virtaul and inverted.
(b) Real and erect.
(c) Real, inverted and diminished.
(d) Real, inverted and same size of an object.
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Ray Optics » Exercise - 115. An object is placed at a distance of 40 cm infront of concave mirror of focal length 20 cm. The image produced ______ . (a) Virtaul and inverted. (b) Real and erect. (c) Real, inverted and diminished. (d) Real, inverted and same size of an object.- Ray Optics » Exercise - 1 1. Image formed by a convex mirror is : (a) Real (b) Inverted (c) Virtual, erect and diminished (d) None of these
- Ray Optics » Exercise - 12. Image formed by a concave mirror is : (a) Real (b) Inverted (c) Real, Inverted and equal in size of lmage (d) None of these
- 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 - 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