............. radiations are not absorbed by quartz prism.

Options

A. Micro
B. Radio
C. IR
D. UV

Explanation

To solve the question regarding which radiations are not absorbed by a quartz prism, we can follow these steps:

### Step 1: Understand the Properties of Quartz
Quartz is a type of crystal that is transparent to certain wavelengths of light. It is important to know that different materials absorb different parts of the electromagnetic spectrum.

**Hint:** Research the transparency of quartz in relation to the electromagnetic spectrum.

### Step 2: Identify the Electromagnetic Spectrum
The electromagnetic spectrum includes various types of radiation, ranging from gamma rays to radio waves. The order of increasing wavelength (or decreasing frequency) is as follows: gamma rays, x-rays, ultraviolet (UV) rays, visible light, infrared rays, microwaves, and radio waves.

**Hint:** Familiarize yourself with the electromagnetic spectrum and the properties of different types of radiation.

### Step 3: Analyze the Given Options
The options provided in the question are:
1. Microwaves
2. Radio waves
3. Infrared
4. Ultraviolet (UV)

**Hint:** Consider the frequency and energy of each type of radiation in the options.

### Step 4: Determine Which Radiation is Not Absorbed by Quartz
Quartz is known to transmit ultraviolet (UV) light effectively. In contrast, microwaves, radio waves, and infrared radiation have lower frequencies and are generally absorbed by quartz. Therefore, the radiation that is not absorbed by quartz is ultraviolet (UV) radiation.

**Hint:** Compare the frequencies of the options to determine which one is the highest, as higher frequency radiation is less likely to be absorbed.

### Final Answer
The radiations that are not absorbed by quartz prism are **ultraviolet (UV) rays**.