The refractive indices of four substances P, Q, R and S are 1.50, 1.36, 1.77 and 1.31 respectively. The speed of light is the maximum in the substance :
P
Q
R
S
Depth of swimming pool floor appears lesser than its actual depth. This is because of
refraction
dispersion
diffraction
polarisation
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
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 refraction of light is commonly known as
bending
scattering
reflection
interference
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
Light travelling from a denser medium to a rarer medium along a normal to the boundary"
is refracted towards the normal
is refracted away from the normal
goes along the boundary
is not refracted
The refractive index of water is:
1.33
1.50
2.42
1.36
Where should an object be placed in front of a convex lens to get a real image of the size of the object?
At the principal focus of the lens
At twice the focal length
At infinity
Between the optical centre of the lens and its principal focus
A ray of light travelling in water falls at right angles to the boundary of a parallel-sided glass block. The ray of light :
does not get refracted
is reflected along the same path