When a ray of light travelling in glass enters into water obliquely :
it is refracted towards the normal
it is not refracted at all
it goes along the normal
it is refracted away from the normal
Which one of the following materials cannot be used to make a lens?
Water
Glass
Plastic
Clay
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
A convex lens of focal length 50 cm
A concave lens of focal length 50 cm
A convex lens of focal length 5 cm
A concave lens of focal length 5 cm
A person finds difficulty in seeing nearby objects clearly. His vision can be corrected by using spectacles containing :
converging lenses
diverging lenses
prismatic lenses
chromatic lenses
Light has a speed
3 x 108 m/s
4 x 105 m/s
23 x 102 m/s
8 x 103 m/s
The unability of human eye to see nearly objects
Short sightedness
Real image
Virtual image
Long sightedness
A person cannot see distant objects clearly. His vision can be corrected by using the spectacles containing:
concave lenses
plane lenses
contact lenses
convex lenses
A diverging lens is used in :
a magnifying glass
a car to see objects on rear side
spectacles for the correction of short sight
a simple camera
The ratio of the speed of light in vacuum to that in a medium is known as
magnification
refraction
refractive index
Snell's law
A ray of light passes from glass into air. The angle of refraction will be :
equal to the angle of incidence
greater than the angle of incidence
smaller than the angle of incidence
45o
