Sunlight on earth is
convergent
divergent
parallel
irregular
Radius of curvature, r =
f/2
2f
2/3 f
f
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
Umbra is a region of
complete darkness
partial darkness
partial brightness
complete brightness
Plane mirrors are arranged parallel to each other to get :
a single image
two images
a large number of reflected images
no image
Which type of mirror is used in box-type solar cooker?
Spherical mirror
Convex mirror
Plane mirror
Concave mirror
Water is
transparent
translucent
opaque
polymer
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
An ideal mirror
absorbs all the amount of light incident on it
refracts all the light
reflects all the light
none of the above
