Geometrical shadow is formed due to the phenomenon of

Options

A. diffraction of light
B. polarisation of light
C. interference of light
D. rectilinear propapation of light

Answer

To solve the question "Geometrical shadow is formed due to the phenomenon of," we can follow these steps:

### Step 1: Understand the Concept of Shadows
Shadows are formed when an object blocks the path of light from a light source.

**Hint:** Think about what happens when you stand in front of a light source.

### Step 2: Identify the Nature of Light Propagation
Light travels in straight lines, which is known as rectilinear propagation. This means that light does not bend around objects but travels in straight paths.

**Hint:** Recall the behavior of light in a dark room when you turn on a flashlight.

### Step 3: Relate the Blocking of Light to Shadow Formation
When an object obstructs the path of light, it prevents light from reaching the area behind it, resulting in a shadow. This phenomenon occurs because light travels in straight lines.

**Hint:** Consider how the size and shape of the shadow change with the position of the object and light source.

### Step 4: Conclude the Answer
Since the formation of a geometrical shadow is due to the blocking of light and the straight-line propagation of light, we conclude that the geometrical shadow is formed due to the phenomenon of rectilinear propagation of light.

**Hint:** Think about the definition of rectilinear propagation and how it relates to shadows.

### Final Answer
Geometrical shadow is formed due to the phenomenon of rectilinear propagation of light.