Difference between Reflection and Refraction

Reflection and refraction both involve the behavior of light interacting with different materials, but they are distinct phenomena. Reflection of light is the process of bouncing back light rays when they strike the smooth and shiny reflecting surface. Refraction of light is defined as the change in direction or the bending of a light wave passing from one medium to another due to the change in speed of the wave. 

In this article, we are going to learn about the difference Between reflection and refraction in detail.

What is Reflection?

Reflection of light is the phenomenon where light beam strikes any polished, smooth, or bright object and bounces back to our eyes. . This phenomenon occurs when a light rays striking a surface return to the same medium rather than passing through it

The laws of reflection are simple and consistent. There are two main laws. They are :

• The incident ray, the reflected ray, and the normal all lie on the same plane.
• The angle of incidence (∠i) is always equal to the angle of reflection (∠r).

Applications of Reflection

Reflection has many practical applications. It is used in creating various types of mirrors.

• Flat mirrors are common in bathrooms and dressing rooms. They reflect light and create images with accurate proportions and details.

• Curved mirrors, like those in vehicle rearview mirrors, can offer wider views or magnify images by reflecting light.

• Reflective surfaces are also essential in technology. They are used in solar panels and telescopes. In solar panels, mirrors focus sunlight to generate more heat and improve energy efficiency.

Refraction

Refraction of light is the phenomenon where light rays bend when they pass from one medium into another medium of different optical density. This bending occurs due to the change in speed of light in different media.

There are two laws of refraction.

• The reflected, incident, and the normal at the point of incidence all will tend to lie in the same plane.

• The ratio of the sine of the angle of the incidence and refraction is constant. This is called Snell’s law.

n₁ sin θ₁ = n₂ sin θ₂

Where,

• n₁ is the initial media,
• θ₁ is the angle of incidence,
• n₂ is the final media,
• θ₂ is the angle of refraction

Examples of Refraction

• Refraction explains natural phenomena like rainbows. When light passes through raindrops, it bends and spreads out into colors. This colorful bending is why we see rainbows in the sky after it rains.

• Another example is the mirage, an optical illusion often seen on hot days on roads. Light bends as it travels through air layers of different temperatures, making it look like there is water on the road.

Refraction has practical applications in many fields. It is used in designing lenses for various optical devices like microscopes, telescopes, and binoculars.

Difference Between Reflection and Refraction

Here is a table that tabulates the differences between reflection and refraction of light:

Aspect	Reflection	Refraction
Definition	Reflection is the bouncing back of light rays when they hit a surface.	Refraction is the bending of light rays when they pass from one medium to another.
Cause	Occurs when light rays hit an opaque surface.	Occurs when light rays pass through the boundary between two different transparent mediums.
Behavior of Light	Light rays change direction back into the same medium.	Light rays change direction as they enter a different medium.
Angle	The angle of incidence is equal to the angle of reflection.	The angle of incidence is different from the angle of refraction, governed by Snell’s Law.
Applications	Used in mirrors, periscopes, solar reflectors.	Used in lenses, prisms, binoculars, eyeglasses.
Energy Transfer	No energy is transferred to another medium, but it can be absorbed or dispersed in some cases.	Some energy is transferred to the new medium, with potential changes in speed and wavelength.
Outcome	Light stays in the same medium and follows a predictable path.	Light enters a new medium, which can cause dispersion, and can also alter speed and wavelength.
Surfaces	Requires reflective surfaces like mirrors.	Can occur at any interface where there is a change in the refractive index.
Laws	Governed by the law of reflection.	Governed by the laws of refraction, primarily Snell’s Law.

Read More,

• Refraction Through a Rectangular Glass Slab
• Real Life Applications of Refraction of Light
• Refractive Index

FAQs on Difference Between Reflection and Refraction

What is the difference between reflection and refraction of light?

Reflection involves light bouncing back from a surface, while refraction involves light bending as it passes from one medium to another.

How do the laws of reflection and refraction differ?

The law of reflection states that the angle of incidence equals the angle of reflection. In contrast, Snell’s Law of refraction states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant, depending on the medium involved.

What are some common applications of reflection and refraction?

Reflection is commonly used in mirrors, solar cookers, and periscopes, whereas refraction is utilized in glasses, cameras, microscopes, and prisms.

What happens to light’s speed and wavelength when it undergoes refraction?

When light refracts, its speed and wavelength change depending on the optical density of the new medium, unlike reflection where they generally remain consistent in the same medium.

How do reflection and refraction affect the path of light?

Reflection causes light to maintain its path within the original medium, but changes its direction. Refraction leads to a change in the light’s direction and its path as it moves into a different medium.

Can reflection and refraction occur simultaneously?

Yes, at the interface of two media, some of the incident light can be reflected back into the original medium, while the rest is refracted into the second medium. This simultaneous occurrence is common in scenarios like looking into a water body, where you see both underwater objects and surface reflections.