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Ray Optics – 1 – 3

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

ANSWER

EXPLANATION

12. The value of atleast distance of distinct vision is :

(a) 23 cm
(b) 24 cm
(c) 25 cm
(d) 26 cm

ANSWER

EXPLANATION

13. A plane mirror produced a magnification of :

(a) -1
(b) +1 
(c) Zero
(d) Between 0 and

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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.

ANSWER

EXPLANATION

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