The mirror used in astronomical telescope :
Concave
Convex
Spherical
Plano-convex lenses
The mirror used by a dentist to examine the teeth of a patient is :
convex
concave
plane
both concave and convex
The focal length of a spherical mirror of radius of curvature 30 cm is :
10 cm
15 cm
20 cm
30 cm
The ratio of the sine of the angle of incidence to the sine of angle of refraction is constant and is called
Malu's law
Snell's law
Optical density
Relative density
The refraction of light is commonly known as
bending
scattering
reflection
interference
A diverging lens is used in :
a magnifying glass
a car to see objects on near side
spectacles for the correction of short sight
a simple camera
A man is using concave mirror for shaving.If his face is 20 cm from the mirror having magnification 2,what will be the radius of curvature of the mirror?
60 cm
80 cm
50 cm
40 cm
Light enters from air into a glass plate having refractive index 1.50. What is the speed of light in glass ?(The speed of light in vacuum is 3 x 108 m/s)
2 x 108 m/s
1.82 x 108 m/s
4 x 108 m/s
2 x 106 m/s
A virtual image is one which
can be taken on a screen
cannot be taken on a screen
sometimes can be and sometimes cannot be taken on a screen
is formed only by a concave mirror
What type of lens will form when a tumbler is filled with water?
Bi convex
Concavoconvex
Plano convex
Biconcave
