The lens power is 1D, what will be its focal length in centimeter?
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.
What will be the power of convex lens having focal lengthcm?
b) -2 D
c) +50 D
d) -6 D
a) +2 D
Q.6.
What will be the focal length of a convex lens having power -1.5 D?
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.
At what distance the image will be formed when an object is placedcm from a convex lens whose focal length iscm?
a) 50 cm
b) 5.66 cm
c) 6.66 cm
d) 16.66 cm
Q.11.
What is the least distance for distinct vision?
a) 25 m
b) 25 cm
c) 25 mm
d) 2.5 cm
Q.12.
A ray of light travels from a medium of refractive index m1 to a medium of refractive index mIf “i” and “r” are the angle of incidence and refraction, then what is sin(i)/sin(r)?
a) m1
b) m2
c) m12
d) m21
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