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WorksheetsLIGHT - CLASS 8
Total questions: 21
Worksheet time: 12mins
When a light ray incidents on a polished surface , bounces back is called.
solar energy
refraction
reflection of light
point of incidence
The point where the incident ray meets the shiny surface. Here, _________ is the point of incidence on the surface.
I
R
O
P
STATE TRUE OR FALSE : ANGLE OF INCIDENCE = ANGLE OF REFLECTION.
TRUE
CORRECT IN THE CASE OF REFRACTION
FALSE
Images formed by plane mirror are :
Upright
same distance
lateral inversion
the distance varies
Real - life applications of multiple reflection are :
Mirror maze
doctor's clinic
periscope
hair salons
The formula for the no. of images formed in a plane mirror is :
n = (360 / θ) - 1
n = (360 / θ) + 1
n = (360 / 30) - 1
No formula
The term 'kaleidoscope' means :
beautiful scenery
submarines
telescope
beautiful form of viewing
An important consideration for refraction to happen is that both the media through which light is travelling should have ________________ densities.
opposite
equal
in a ratio
different
2 mirrors are kept in the angle 45 degrees. Find how many images are formed by the mirrors.
7
6
8
5
Speed of light in air is :
1.8 * 10 to the power 8 m/s
3 * 10 to the power 8 km/h
2.25 * 10 to the power 9 m/s
3 * 10 to the power 8 m/s
So when light is travelling from glass through air then the ray bends ___________ from the normal. When light is travelling from air to glass then it bends _________________ the normal.
Towards ; away
Away ; towards
same as reflection
None of the above
_______________ has 2 identical bases in the form of a parallelogram. When viewed in 2 dimensions , it appears to be a triangle.
cuboid
cube
trapezium
prism
In the case of a prism, incident ray is not parallel to the emergent ray.
TRUE
FALSE
________________ is defined as the band of seven colors that is formed by splitting of white light. The phenomenon due to which it happens is called _______________.
reflection ; dispersion
rarefaction ; rarefraction
spectrum ; dispersion
dispersion ; spectrum
When the intensity of light is more, the ________ makes the ___________ contract and when the intensity of light is less, then the __________ makes the __________dilate.
iris ; pupil
pupil ; iris
cornea ; eye lens
None of them
________ are sensitive to dim light whereas __________ are sensitive to bright light.
rods
pupil
cornea
cones
The least distance of distinct vision for an infant is _______cm to _____ cm.
25
infinite
5 - 8
10 - 12
This spot is insensitive to light and is called the area of no vision.
cataract
blind spot
partial blind
All of the above.
Myopia can be corrected by using __________________ lens.
convex
concave
diverging
bi - lens
Cataract is also known as __________________.
young age defect.
old age defect.
cloudy defect
blind
Is it necessary to take care of our eyes ?
