Question

Three beams of light 1, 2 and 3 of the same wavelength are sent through three different materials of refractive indices 1.60, 1.50 and 1.55. Arrange the speed of these beams in different materials in ascending order.

Answer 1

1.60<1.55<1.50 as speed of light is higher in a rarer medium than denser medium.

Answer 2

Answer:

The speed of these beams in different materials in ascending order is 1.60 < 1.55 < 1.50

Explanation:

Refractive index of a material:

• The difference between the speed of light travelling through air and any material is known as the refractive index.
• The degree to which light rays are bent when they go from one substance to another is indicated by the term "refractive index."
• The density and temperature of a substance have an effects on its absolute refractive index. Additionally, it is influenced by the light's wavelength.

$Refractive index of a material = \frac{Speed of light in air}{Speed of light in material }$

• Speed of light is higher in rarer medium than the denser medium.
• Because a denser medium will allow light to travel through it more slowly, it will have a higher refractive index.
• The material with the lowest refractive index will have the highest light speed. The speed is increasing in the order 1 < 3 < 2.

Therefore speed of light in different materials in ascending order

1.60 < 1.55 < 1.50

Final answer:

The speed of these beams in different materials in ascending order is 1.60 < 1.55 < 1.50

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