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11. A virtual image larger than the object can be produced by (NTSE Odisha, Stage-I, 2012-13)
Convex mirror
Concae lens
Concave mirror
Plane mirror
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12. A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an erect and virtual image at 10 cm from the lens? (NTSE Odisha, Stage-I, 2012-13)
30 cm
15 cm
60 cm
10 cm
13. A lens of power +3 D and another of power -1.5 D are placed in contact. What would be the focal length of the combination? (NTSE Odisha, Stage-I, 2012-13)
1.5 m
-0.67 m
0.67 m
-67.0 m
14. The centre of curvature of a concave mirror (NTSE Madhya Pradesh, Stage-I, 2012-13)
Lies in front of it
Lies behind it
Lies on the surface of the mirror
Is a part of the mirror
15. The instrument that is based on the principle that when an object is placed between first principle focus and the optic centre of convex lens, an upright, virtual and enlarged image on the same side of the object is formed, is (NTSE Andhra Pradesh, Stage-I, 2012-13)
Telescope
Projector
Camera
Simple microscope
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