Answer
Verified
445.8k+ views
Hint: Here refraction of light is happening, i.e. when light travels from vacuum to the flat surface, medium changes and light rays bends while changing its path. But the light ray can get refracted at a certain limit after that it gets totally reflected to the same medium it travelled from. Here we will discuss the phenomenon of refraction in brief and from that we will get our answer.
Formula used:
\[\sin {{i}_{c}}=\dfrac{1}{\mu }\]
Complete step-by-step answer:
In refraction of light, when light travels from denser to rarer medium or rarer to denser medium the rays will get refracted i.e. it bends away or towards the normal. Normal is an imaginary line taken perpendicular to the medium. But after a particular angle light will be reflected back to the same medium, the angle at which the light ray gets reflected back to the medium it was coming from is known as the critical angle of incidence. Critical angle for light travelling from denser to rarer medium is given as
\[\sin {{i}_{c}}=\dfrac{1}{\mu }\]
Here, the light is travelling from denser to rarer (vacuum), hence by substituting the value of the refractive index we will get the critical angle.
\[\begin{align}
& \sin {{i}_{c}}=\dfrac{1}{\sqrt{2}} \\
& {{i}_{c}}=\sin {{\left( \dfrac{1}{\sqrt{2}} \right)}^{-1}} \\
& {{i}_{c}}=45{}^\circ \\
\end{align}\]
The critical angle for the transparent hemisphere is \[45{}^\circ \], for an angle of incidence greater or equal to critical angle, light will get totally reflected back.
Now let us consider the figure given and draw a normal and the critical angle
We can see for the green strip the angle of incidence is the same as critical angle. For orange and red angles of incidence will be greater than the critical angle. Therefore for orange, red and green stripes the ray will get totally reflected. Whereas, for yellow, indigo and blue stripes angle of incidence is smaller than critical angle and we get a refracted ray. Therefore people will see the yellow, indigo and blue stripes.
So, the correct answers are “Option B and C”.
Note: The given question has multiple correct options that means one or more than one option can be right.
In case the ray travels from rarer to denser medium the critical angle will be given as the sine of critical angle will be equal to the refractive index. Also note that angle of incidence is taken from normal towards the plane.
Formula used:
\[\sin {{i}_{c}}=\dfrac{1}{\mu }\]
Complete step-by-step answer:
In refraction of light, when light travels from denser to rarer medium or rarer to denser medium the rays will get refracted i.e. it bends away or towards the normal. Normal is an imaginary line taken perpendicular to the medium. But after a particular angle light will be reflected back to the same medium, the angle at which the light ray gets reflected back to the medium it was coming from is known as the critical angle of incidence. Critical angle for light travelling from denser to rarer medium is given as
\[\sin {{i}_{c}}=\dfrac{1}{\mu }\]
Here, the light is travelling from denser to rarer (vacuum), hence by substituting the value of the refractive index we will get the critical angle.
\[\begin{align}
& \sin {{i}_{c}}=\dfrac{1}{\sqrt{2}} \\
& {{i}_{c}}=\sin {{\left( \dfrac{1}{\sqrt{2}} \right)}^{-1}} \\
& {{i}_{c}}=45{}^\circ \\
\end{align}\]
The critical angle for the transparent hemisphere is \[45{}^\circ \], for an angle of incidence greater or equal to critical angle, light will get totally reflected back.
Now let us consider the figure given and draw a normal and the critical angle
We can see for the green strip the angle of incidence is the same as critical angle. For orange and red angles of incidence will be greater than the critical angle. Therefore for orange, red and green stripes the ray will get totally reflected. Whereas, for yellow, indigo and blue stripes angle of incidence is smaller than critical angle and we get a refracted ray. Therefore people will see the yellow, indigo and blue stripes.
So, the correct answers are “Option B and C”.
Note: The given question has multiple correct options that means one or more than one option can be right.
In case the ray travels from rarer to denser medium the critical angle will be given as the sine of critical angle will be equal to the refractive index. Also note that angle of incidence is taken from normal towards the plane.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Which are the Top 10 Largest Countries of the World?
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
Give 10 examples for herbs , shrubs , climbers , creepers
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
How do you graph the function fx 4x class 9 maths CBSE
Write a letter to the principal requesting him to grant class 10 english CBSE