Assertion (A): Refractive index have no units.
Reason (R): the refractive index is ratio of two similar quantities.

Options

A. Both Assertion and Reason are true and Reason is correct explanation of Assertion.
B. Both Assertion and Reason are true and Reason is not correct explanation of Assertion.
C. Assertion is true but Reason is false.
D. Assertion is faise but Reason is true

Explanation

To analyze the assertion and reason provided in the question, we can break down the solution into the following steps:

### Step 1: Understand the Assertion
The assertion states that the refractive index has no units. We need to determine if this statement is true.

### Step 2: Define Refractive Index
The refractive index (denoted as \( \mu \)) is defined as the ratio of the speed of light in vacuum (\( c \)) to the speed of light in a medium (\( v \)):
\[
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