Decide which statements are true and false about total internal reflection: A sm

Question

Decide which statements are true and false about total internal reflection:
A smaller critical angle means that total internal reflection is more likely to occur.

When light hits a boundary at less than a critical angle, it will undergo total internal reflection

Total internal reflection is more efficient than simple reflection of light off a silvered mirror, so prisms are often used in optical instruments to minimize light loss.

Magnifying glasses are a practical application of the phenomenon of total internal reflection

Explanation / Answer

Applying snell law to a bondary the critical angle theta is given by

Sin(theta)=1/n where n is the refractive index of the medium.

1. Smaller critical angle means that there is a more chance to get an incident angle larger than itself. Thus more chance for total internal reflection. TRUE

2. By definition critical angle is the minimum incident angle required for total internal reflection to occur.FALSE

3. When a light ray travels from one medium to another, some part of the light gets transmited at the boundary and the rest gets reflected back to the initial medium. In total internal reflection everything gets reflected back to the initial medium. Therefore more efficient. TRUE

4. Magnifying glass is made of a lense. Light should be transmitted throu it. Therefore total internal reflection should not happen at any case. FALSE

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