Click to Chat

1800-1023-196

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
`        What is diffraction and explain the two types of diffraction???`
one year ago

Anish Singhal
1195 Points
```							Suppose there is a dark room, a completely dark room and through the window, there is a small hole. When light enters through that tiny hole, what happens? We see that through the small hole light enters but instead of just bright light, we see a region of light and dark bands. This is nothing but the diffraction of light.Diffraction effect depends upon the size of obstacle. Diffraction of light takes place if the size of obstacle is comparable to the wavelength of light.Diffraction of light can be divided into two classes:Fraunhoffer diffraction.Fresnel diffraction.For more details refer to this linkhttps://www.askiitians.com/iit-jee-wave-optics/diffraction-and-polarization/#fresnel-and-fraunhofer-diffraction
```
one year ago
Tony
108 Points
```							It is the bending of light around the corner of an obstacle. Reflected light produces fridges of light, dark or colored bands. At times diffraction of sunlight in clouds produces a multitude of colors. Example of diffraction in nature is diamond rays in the solar eclipse. Diffraction Types of DiffractionThere are two types of diffractions Fresnel DiffractionFraunhofer DiffractionDiffraction From the above figure, we observe that the source is located at a finite distance from the slit, and the screen is also at a finite distance from the slit. The source and the screen are not very far from each other. So this is a Fresnel diffraction. Here, if suppose the ray of light comes exactly at the edge of the obstacles, the path of the light is changed. So the light bends a little and meets the screen. A beam of width α travels a distance of α2/λ , called the Fresnel distance before it starts to spread out due to diffraction. But when the source and the screen are far away from each other, and when the source is located at the infinite position, then the ray of light coming from that infinite source are parallel rays of light. So this is Fraunhofer diffraction. Here we have to make use of the lens. But why do we use the lens? Because in Fraunhofer diffraction, the source is at infinity so the rays of light which pass through the slit are parallel rays of light. So in order to make these rays parallel to focus on the screen, we, make use of the converging lens. The zone which we get in front of the slit is the central mFresnel diffraction: produced when light from a point source meets an obstacle, the waves are spherical and the pattern observed is a fringed image of the object. Fraunhofer diffraction: occurs with plane wave-fronts with the object effectively at infinity.axima. On either side of central maxima, there is bright zone i.e 1st maxima. Fresnel diffraction: produced when light from a point source meets an obstacle, the waves are spherical and the pattern observed is a fringed image of the object. Fraunhofer diffraction: occurs with plane wave-fronts with the object effectively at infinity.
```
one year ago
Think You Can Provide A Better Answer ?

## Other Related Questions on General Physics

View all Questions »

### Course Features

• 731 Video Lectures
• Revision Notes
• Previous Year Papers
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Test paper with Video Solution

### Course Features

• 18 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions