Physics
The angle of deviation becomes minimum when:
- i1 = r1
- i1 = r2
- i1 = i2
- r2 = i2
Answer
i1 = i2
Reason — The angle of deviation becomes minimum when angle of incidence (i1) becomes equal to the angle of emergence (i2). This phenomenon occurs when the light ray inside the prism is incident at the minimum deviation angle and is known as the angle of minimum deviation.
Related Questions
In the figure given ahead the correct statement is:
- ABED and ABC are the refracting surfaces.
- line AD is the refracting edge
- angle a is the angle of deviation
- AB is the base of the prism.
The angle of prism A is given as:
- r1 - r2
- i1 + i2
- r1 + r2
- r1 / r2
In position of minimum deviation, the refracted ray inside the prism is …………… to its base:
- normal
- inclined at 45°
- parallel
- none of the above
Mention the incorrect statement:
- The angle of deviation produced by a prism depends on the colour or wavelength of the light used.
- The angle of incidence also affects the angle of deviation produced by the prism.
- In a prism as well as a parallel sided glass slab the emergent ray is parallel to the incident ray with a lateral displacement.
- The angle of deviation of prism is also affected by the material of the prism.