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WorksheetsQuiz from Light
Total questions: 10
Worksheet time: 8mins
The characteristic of lens is ..........
transparent .
refracting.
bounded by two curved surface.
all of the above.
Which is not the type of lens?
convex
concave
spherical
concavoconvex
The use of convex lens is .......
in spectacles to correct short sightedness
as a burning glass
in the peep hole of the door
in Gallilean telescope
The use of concave lens is .........
in spectacles to correct long sightedness
in the peep hole of the door
as a burning glass
in optical instrument like camera, microscope
Optical center is defined as
center of the sphere of which lens is a part
the point at the principal axis where parallel light rays meet after refracting through convex lens
the geometrical center of the lens
the point where image is formed by lens
What is focus?
the point at principal axis where parallel light rays meet after refracting through convex lens
center of the sphere of which the lens is a part
the point where image is formed
the geometrical center of the lens
The distance between focus and optical center is called .......
radius of curvature
principal axis
focal length
object distance
What do you understand by object distance?
distance of image from optical center
distance of image from focus
distance of object from optical center
distance of image from focus
The power of lens is measured in ....... unit.
watt
joule
candela
dioptre
What is the nature of the image formed by convex lens when an object is kept beyond 2F ?
at 2F, real, inverted and magnified
between F & 2F, real, inverted, diminished.
beyond 2F, real, inverted, highly magnified
virtual, erect and diminished
