Physics
Out of violet, blue, yellow and red, the critical angle would be the least for …………… light for a pair of media.
- violet
- blue
- blue
- yellow
Related Questions
The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. The ray PQ would:
![The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. [Write necessary angles.] ICSE 2019 Physics Solved Question Paper.](https://cdn1.knowledgeboat.com/img/abp10/5/icse-2019-physics-question-paper-solved-2e-1200x730.png)
- pass undeviated
- suffer refraction
- suffer reflection
- suffer total internal reflection
In the process of total internal reflection, …………… of energy (or intensity) of light is reflected back.
- 70%
- 80%
- 100%
- 50%
A ray of white light is incident on the interface of glass and air as shown in the figure. At the given angle of incidence, green light suffers total internal reflection. The rays emerging out from glass to air contain :
- yellow, orange and red colours
- violet, indigo and blue colours
- all colours
- all colours except green
How is the critical angle related to the refractive index of a medium?