Question

What is total internal reflection give conditions for total internal reflection?

Answer 1

Answer:

The conditions for total internal reflection are the the light is travelling from an optically denser medium (higher refractive index) to an optically less dense medium (lower refractive index) and that the angle of incidence is greater than the critical angle.

Answer 2

$\Large\underline\mathfrak{Question}$

What is total internal reflection give conditions for total internal reflection?

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$\Large\bold\star\underline{\underline\textbf{Total internal reflection\:}}$

→ The phenomenon of complete reflection of light back into the same medium for angles of incidence greater than the critical angle is called total internal reflection.

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$\Large\bold\star\underline{\underline\textbf{Conditions Required\:}}$

→ Light should travel from a denser medium to rarer medium.

→ Angle of incidence in the denser medium should be greater than critical Angle.

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$\Large\bold\star\underline{\underline\textbf{Explanation\:}}$

→ Check the attachment First.

→ Suppose an interfáce XY separates a rarer medium from a denser medium as shown in the figure (provided with this answer) 'O' is the point object in the denser medium. An incident ray 'OA' which is normal to the interface goes along AB. Another incident ray OA1 , deviates away from the normal and goes along A1B1 , and so on.

→ For a particular value of angle of incidence i = C, called the critical angle, the incident ray OA2 goes along A2B2 , along the surface of interface XY.

→ The angle of incidence in the denser medium for which the angle of refraction is 90° is called critical angle. When (angle of incidence) i > C (critical angle) , as for the incident ray OA3 the ray OA3 goes along A3B3. In this case, the ray is totally reflected and this phenomenon is called total internal reflection.

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Hope it helped u.

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