Q.1
##### What is the SI unit for the power of the lens?
• a) Watt
• b) Dioptre
• c) Meter
• d) Centimeter
Q.2
• a) 100
• b) 0.91
• c) 0.1
• d) 10
Q.3
##### Name the lens used in a simple microscope.
• a) Biconvex
• b) Biconcave
• c) Plano-convex
• d) Cylindrical
Q.4
##### If the magnification is positive and greater than unity, what does it indicate?
• a) Virtual image
• b) Real image
• c) Distorted image
• d) Erect image
Q.5
• b) -2 D
• c) +50 D
• d) -6 D
• a) +2 D
Q.6
• a) -66.66 cm
• b) +66.66 cm
• c) +1.5 cm
• d) -1.5 cm
Q.7
##### How will be the image formed, when an object is placedcm from a convex lens, whose focal length iscm?
• a) Virtual and enlarged
• b) Virtual and reduced in size
• c) Real and enlarged
• d) Real and reduced in size
Q.8
##### At what distance the object should be placed, when convex lens is used as simple magnifying glass?
• a) Less than one focal length
• b) Less than twice the focal length
• c) More than one focal length
• d) More than twice the focal length
Q.9
##### What type of image is produced by a concave lens?
• a) Always virtual and enlarged
• b) Always real
• c) Always virtual and reduced in size
• d) Sometimes real and sometimes virtual
Q.10
• a) 50 cm
• b) 5.66 cm
• c) 6.66 cm
• d) 16.66 cm
Q.11
• a) 25 m
• b) 25 cm
• c) 25 mm
• d) 2.5 cm
Q.12
• a) m1
• b) m2
• c) m12
• d) m21