WorksheetsLight, Reflection and Refraction
Total questions: 20
Worksheet time: 20mins
When light falls on a smooth polished surface, most of it
is reflected in the same direction
is reflected in different directions
is scattered
is refracted into the second medium
A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:
I
II
III
IV
If the image is formed in front of the mirror, then the image distance will be
positive or negative depending on the size of the object
positive
negative
neither positive nor negative
When the object is placed between f and 2f of a convex lens, the image formed is
at f
at 2f
beyond 2f
between O and f
A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be
the mirror is convex and the lens is concave
the mirror is concave and the lens is convex
both convex
both concave
Focal length of a concave mirror is
negative
positive
depends on the position of object
depends on the position of image
The image formed by a convex lens can be
virtual image is not formed
virtual and of same size
virtual and diminished
virtual and magnified
If an incident ray passes through the focus, the reflected ray will
pass through the pole
be parallel to the principal axis
retrace its path
pass through the center of curvature
The speed of light in vacuum is
3×108m/s
2.8×108m/s
3×107m/s
3×109m/s
Power of a lens is the ………. of its focal length.
value
reciprocal
2 times
half
Image formed by reflection from a plane mirror is
real and inverted
virtual and erect
real and erect
virtual and inverted
Magnifying power of a concave lens is
can have any value
always = 1
always < 1
always > 1
A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:
at infinity
at focus
at the pole
behind the mirror
If the power of a lens is – 2 D, what is its focal length?
+50 cm
-50 cm
-100 cm
+100 cm
If the magnification produced by a lens has a negative value, the image will be
real and inverted
real and erect
virtual and erect
virtual and inverted
Which mirror can produce a virtual, erect and magnified image of an object?
Both concave and convex mirrors
Plane mirror
Convex mirror
Concave mirror
A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it
does not enter at all
goes straight into the second medium
bends away from the normal
bends towards the normal
A ………. mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.
concave
convex
No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be plane or convex mirror.
True
False
The optical phenomena, twinkling of stars, is due to
Atmospheric reflection
Total reflection
Atmospheric refraction
Total refraction
