Light is a form of energy that causes the sensation of
hearing
heat
sight
touch
When an opaque object comes in the path of light it forms
an image with colours
shadow
black and white image
depends on the colour of light
Which of the following is transparent ?
Stone
Wood
Plastic
Glass
Nature of the shadow depends on
the relative distance between the source of light and the object
the relative size of the source of light and the object
the angle between the source of light and the object
all of the above
Concave mirror is used in
Solar devices
Car headlights
Dentist's mirror
All of these
Umbra is a region of
complete darkness
partial darkness
partial brightness
complete brightness
The speed of light is
the same in all media
the greatest in vaccum
greater in air than in vaccum
does not change from medium to medium
Plane mirrors are arranged parallel to each other to get :
a single image
two images
a large number of reflected images
no image
Water is
transparent
translucent
opaque
polymer
Opaque objects
allow the light to pass through them.
do not let the light to pass through them.
absorb some amount of light and let the remaining to pass through them.
allows the light from natural sources and rejects if it is from artificial sources.