Physics
The optical density of turpentine is higher than that of water, while its mass density is lower than water. The figure given below shows a layer of turpentine floating over water taken in a container. For which one of the four rays incident on turpentine in the path shown in the figure is correct?
- Ray 1
- Ray 2
- Ray 3
- Ray 4
Answer
Ray 2
Reason — Here water is rarer medium and turpentine is denser medium and when light travels from denser to rarer medium it bends away from the normal and vice versa.
Ray 1 : As it enters from turpentine to water then it should bend away from the normal but here it is bending towards the normal.
Ray 2 : It follows laws of refraction perfectly since it is bending towards normal while entering turpentine and away from it while entering water.
Ray 3 : It shows no deflection while entering any medium which doesn't happen in refraction.
Ray 4 : It is bending away from the normal while entering turpentine whereas it should bend towards the normal.
Related Questions
Which of the following is correct when a ray of light passes from a rarer medium to a denser medium:
(1) speed will decrease
(2) frequency remains unchanged
(3) wavelength will decrease
(4) intensity will decrease- (1)
- (1) and (4)
- (1), (2) and (4)
- all of the above
The refractive index of water is 4/3 and that of glass is 3/2. The refractive index of glass with respect to water is:
- 9/8
- 2
- 8/9
- 1
With respect to light passing from air into water, which of the following statements is correct?
- Angle of incidence is equal to the angle of refraction.
- Angle of incidence is always greater than the angle of refraction
- Angle of incidence is always less than the angle of refraction
- Angle of incidence has no effect on the angle of refraction.
A ray of light is incident normally on a plane glass slab. What will be (i) the angle of refraction and (ii) the angle of deviation for the ray?