Question

For a prism, \( A \) is the angle of the prism, \( \delta \) is the angle of deviation, \( \mu \) is the refractive index of the material of a prism, the refractivity of the material of a prism is

• A. \( \mu \)
• B. \( (\mu + 1) \)
• C. \( (\mu - 1) \)
• D. \( (1 - \mu) \)

Hint:

The refractivity of a material is given by \( R = \mu - 1 \), where \( \mu \) is the refractive index of the material.

Answer 1

The Correct Option is C

Step 1: Understanding the refractivity of a prism.
The refractivity \( R \) of a material of a prism is related to its refractive index \( \mu \) and the angle of the prism \( A \). The refractivity \( R \) of a material is defined as: \[ R = \mu - 1 \] Step 2: Conclusion.
Thus, the refractivity of the material of the prism is \( (\mu - 1) \), which corresponds to option (C).