The refraction of light is commonly known as
bending
scattering
reflection
interference
Linear magnification (m) produced by a rear view mirror fitted in vehicles :
is equal to one
is less than one
is more than one
can be more or less than one depending on the position of object
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 focal length of a spherical mirror of radius of curvature 30 cm is :
10 cm
15 cm
20 cm
30 cm
SI unit of power of lens is
metre
horse power
dioptre
watt
The mirror used by a dentist to examine the teeth of a patient is :
convex
concave
plane
both concave and convex
A concave mirror cannot be used as :
a magnifying mirror
a torch reflector
a dentist's mirror
a rear view mirror
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
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
Power of a lens is - 4D and for the second lens,power is + 2D.The total power for the two in contact is
6 D
-6 D
-2 D
-8 D
