Which of the following is a natural phenomenon?
Electric lamp
Electric filament
Torch light
Sunlight
Which of the following is a reflector of light?
Sun
Moon
Star
Filament
Translucent objects:
do not allow light to pass through them
allow light to pass through them
allow only a partial amount of light to pass through them
absorb all the light incident on them
Which of the following letters will be seen without any change in a plane mirror?
S
T
L
P
Which of the following statements is true?
A plane mirror some times froms an inverted image.
A concave mirror always forms a virtual,erect and diminished image.
A concave lens always forms a virtual,erect and diminished image.
All of these.
Light:
light waves are longitudinal wave
requires a material medium to travel form one place to another
does not require a material medium
light has mass but it is negligible
At a particular time of a day the ratio of height of an object and the length of its shadow is 'x'.Using this calculate the height of a tree if the length of the shadow of tree is L
x/L
x * L
x+L
L-x
The distance between the sun and the earth is
150 million kilometers
100 million kilometers
2 billion kilometers
1.2 light years
The speed of light is
330m/s
300,000,000m/s
30,000m/s
300,000,000km/s
