Burning candle, oil lamp, tube light are _____________
Natural source of light
Artificial source of light
Examples of bioluminescence
None of these.
Substance which allow the light to pass through them completely are called
translucent substance
transparent substances
opaque substances
non luminous substances
The emission of light given out by an organism is called
Luminescence
Bioluminescence
Optical luminescence
Non luminescence
_________ invented Telescope.
C.V Raman
Galileo
Issac Newton
Einstein
_____________ occurs when earth comes in between sun and moon.
Solar eclipse
Lunar eclipse
Linear eclipse
None of these
Substances which allow only partial transmission of light to pass through them are called
Opaque substances
Luminous substances
Transparent substances
Translucent objects
Source of light ,an opaque object and the shadow will always lies in _________ .
a straight line
perpendicular
parallel
none of these
An object is visible when
Light falls on the object
Light falls on the observer
The light is completely stopped
The light rays falls in various direction
______________ is a simple device which is used to take photographs of stationary objects
binoculars
telescope
pinhole camera
microscope
When opaque objects are placed infront of sunlight or torch light ________ is formed behind the object.
Shadow
Light
Sound
Heat