Question

Assertion :The refractive index of a prism depends only on the kind of glass of which it is made of and the colour of light. Reason: The refractive index of a prism depends on the refracting angle of the prism and the angle of minimum deviation.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

We know,

Now, $\mu =\frac{\sin i}{sinr}=\frac{sin\left(\frac{D_m+A}{2}\right)}{\sin \frac{A}{2}}$ is the refractive index of prism.

where $A$ is the refracting angle of the prism, $D_m$ is the angle of minimum deviation.

So refractive index depends on

1. Refracting angle of the prism
2. Angle of minimum deviation
3. And also material of the prism
4. as well as the wavelength of the light i.e., color of the light.