Light enters from air into the following media successively and finally emerges. Medium Refractive Index A 1.5 B 1.26 C 1.33 D 1.0 E 2.0 Which of the following is the correct sequence for the change in the velocity of light?

decrease, increase, decrease, increase, decrease, increase
increase, decrease, increase, decrease, increase, decrease
decrease, increase, increase, decrease, increase, decrease
increase, decrease, increase, increase, decrease, increase

LohaHridoy

17 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 1 : decrease, increase, decrease, increase, decrease, increase

Concept:

Refraction of Light:

When a ray of light propagating in a medium enters the other medium, it deviates from its path.
This phenomenon of change in the direction of propagation of light at the boundary, when it passes from one medium to another medium, is called the refraction of light.
When a ray of light enters from a rarer medium to a denser medium from (air to water) it deviates towards the normal drawn on the boundary of two media at the incident point.
- The entity that doesn't change is the frequency.
- The entity that changes are wavelength and velocity.
- The refractive index is also equal to the velocity of light c of a given and the wavelength in empty space divided by its velocity v in a substance.
- Thus, Velocity, Wavelength & Refractive index change when light travels from one medium to another but Frequency remains unchanged.
Similarly, in passing from denser to rarer medium, a ray deviates away from the normal.
If the light is incident normally on the boundary, i.e. parallel to normal, it enters the second medium undeviated.

Explanation:

Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance,n = (c/v)
Hence, light travels faster in water.
The speed of light is faster in water. The refractive index of water is 1.3 and the refractive index of glass is 1.5.

Medium	Refractive Index	Change In velocity
A	1.5	Decrease
B	1.26	Increase
C	1.33	Decrease
D	1.0	Decrease
E	2.0	Increase

Additional information

The refractive index of a medium for a wave of a given wavelength is defined as the ratio of the speed of a wave in a vacuum to its speed in the medium.
- The refractive index of water is 1.33.
- The refractive index of air is 1.
- The refractive index of glass is 1.5.

17 views Answered 2022-09-04 04:29

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