The geometrical path of a ray of light in a medium of refractive index 2 is 8m. The optical path is
16
8m
4m
None of the above
Which of the following is not property of the photons?
Momentum
Energy
Frequency
Rest mass
If the angle of incidence is i and that of refraction is r. Then the speed of light in the medium to which the light refracted from air is
V= C sinc /sinr
V= C sini/ sinr
V= C sini/cosr
V= c cosr/cosi
The plane faces of two identical plano- convex lenses each having focal length of 80cm, are placed against each other to form a usual convex lens. The distance from this lens at which an object must be placed to obtain a real inverted image with magnification one is
80cm
40cm
20cm
10cm
Which of the following does not support the wave nature of light?
Interference
Diffraction
Dispersion
Photoelectric effect
Which of the following is not the property of light according to the corpuscular theory ?
Light travels in straight line.
The velocity of light is more in air than in water.
The velocity of light changes on refraction.
The velocity of light does not change on reflection.
The wave length of the light of a laser beam can be used as a standard of
Time
Temperature
Length
A glass slab (?=1.5) of thickness 3.0cm is placed on an inkspot. A person looks at if from a distance 5.0cm above the ink spot. The distance of the spot will appear to be
5.0cm
4.5cm
4.0cm
3.5cm
A convex lens of focal length 16cm forms a virtual image of double the size of the object. What is the distance of the object from the lens?
8cm
16 cm
24cm
32cm
A thin prism of 70 and refractive index 1.5 is combined with another prism of angle θ and refractive index 1.7. The emergent ray goes undeviated. What is the value of ϑ ?
30
50
90
110
