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
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
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
90o
120o
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 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
Light has a speed
3 x 108 m/s
4 x 105 m/s
23 x 102 m/s
8 x 103 m/s
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
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
Refractive index of water 1.33. The speed of light through water is
2.25 x 108 m/s
1.66 x 108 m/s
5 x 108 m/s
The speed of light while travelling through oil is measured as 1.85 x 108 m/s. Calculate refractive index of oil ?
1.66
1.77
2.89
3.13
