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Worksheetslight quiz
Total questions: 20
Worksheet time: 7mins
If the 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 centre of curvature
A spherical mirror and a spherical lens have each focal length of -10cm. The mirror and the lens are likely to be
both concave
both convex
the mirror is convex and lens is concave
the mirror is concave and lens is convex
Rays from sun converge at a point 15cm in front of a concave mirror. Where should an object be placed so that the size of its image is equal to the size of the object.
15cm in front of the mirror
30cm in front of the mirror
between 15cm and 30cm
more than 30 cm in front of the mirror
A point is placed at a distance of 20cm from a convex mirror of focal length of 20cm. The image will be formed
at infinity
at focus
at pole
behind the mirror
If magnification produced by a lens has a negative value, the image will be
virtual and inverted
virtual and erect
real and erect
real and inverted
A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of
120
90
45
0
A student does an experiment on tracing he 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 labelling the following indicating figures. Which is the correct figure
4
3
1
2
The refractive index of a transparent medium is the ratio of the speed of light in _______ to that in the________.
(a)
A convex lens (ng= 3/2) when placed in water (nw = 4/3) has increased focal length
true
false
Light is
a longitudinal wave
an elastic wave
an electromagnetic wave
a mechanical wave
While performing an experiment on determination of focal length of convex lens, four students obtained image of the same distant tree on screen as follows. which diagram shows it correctly.
d
a
c
b
When you want to illuminate a larger area you will choose which type of reflection
regular reflection
diffused reflection
any one can be used
none of these
when a ray of light is reflected back into the same medium then
its frequency changes
its wavelength changes
its velocity changes
none of these
If an object placed 21cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is
20
10
18
5
Beams of light are incident through the holes A and B and emerge out of a box through the holes C and D respectively as shown. which of the following could be inside the box
a rectangular glass slab
a convex lens
a prism
a concave lens
Magnification produced by a rear view mirror fitted in vehicles
is less than 1
is more than 1
is equal to 1
can be more or less than 1 depending upon the position of the object in front of it
Assertion: cannot see distant objects clearly
Reason: the far point of an eye, suffering from myopia, is less than infinity
both assertion and reason are correct and reason is the correct explanation of the assertion
both assertion and reason are correct but the reason is not the correct explanation of the assertion
assertion is true but reason is false
reason is true but assertion is false
In order to calculate the power of a lens, we need its focal length in (a) .
Concave and convex mirror diverge the rays which fall parallel to the principal axis.
true
false
An object is located at a distance of 10cm in front of a lens has an image of 20cm behind the lens. Then the power of the lens (in dioptre is)
60
-30
-60
30
