State any one phenomenon in nature which is based on total internal reflection.

Define Total internal reflection

What is total internal reflection?

Name some applications based on Total Internal Reflection.

Name one more phenomenon in nature where the below law is observed.

Answer the following questions Define total internal reflection of light.

Assertion: in optical fibre, the diameter of the core is kept small. Reason: This smaller diameter fo the fibre should have incident angle more than the critical angle required for total internal reflection.

Answer the following questions Name the devices in which total internal reflection of light is used .

Explain Rainbow formation or prove that a rainbow is the combined effect of the refraction, dispersion and total internal reflection of light

Answer the following questions Prove the following statement : A rainbow is the combined effect (an exhibition) of the refraction , dispersion and total internal reflection of light (taken together)

Transmission by optical fibres is an important method in communications. By total internal reflection, light is made to travel only along the core. However, the intensity falls-off exponentially with distance and is given by, I = I_0 ^e-alphax , where alpha is absorption coefficient. Then te correct graph for intensity vs distance is