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  • (i) What is total internal reflection? Under what conditions does it occur? (ii) Find a relation between critical angle and refractive index. (iii) Name one phenomenon which is based on total internal reflection.

(i) What is total internal reflection? Under what conditions does it occur?
(ii) Find a relation between critical angle and refractive index.
(iii) Name one phenomenon which is based on total internal reflection.

 

 

 

 
 
 
 
 

Answers (1)

i) When light travels from optically denser medium to rarer medium, for the angle of incidence greater than the critical angle, the incident ray reflects back to the denser medium. This is called total internal reflection.

Condition for total internal reflection

(a) The light should travel from denser medium to rarer medium

(b) The angle of incidence should be greater than the critical angle.

ii)

The angle of incidence corresponding to r=90^{o} is called the critical angle.

By snells law

\sin i_{c}=\frac{1}{n}

n=\frac{1}{\sin i_{c}}

iii) Mirage is based on total internal reflection.

Posted by

Safeer PP

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