Light has a speed
3 x 108 m/s
4 x 105 m/s
23 x 102 m/s
8 x 103 m/s
Which of these lens are used for image formation in human eye?
Concave lens
Convex lens
Both concave and convex lens
None of these
The refraction of light is commonly known as
bending
scattering
reflection
interference
Which of these are used in astronomical laboratories?
Compound microscope
Telescope
Photographic camera
Magnifing glass
Focal length of convex lens is
1/2 radius of curvature
2 x radius of curvature
equal to radius of curvature
4 x radius of curvature
The refractive indices of four materials A, B, C and D are 1.33, 1.43, 1.71 and 1.52 respectively. When the light rays pass from air into these materials, they refract the maximum in:
material A
material B
material C
material D
A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:
0o
45o
90o
120o
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
In optics an object which has higher refractive index is called
optically rarer
optically denser
optical density
refractive index
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
