The roof prism (RoofPrism) is small and can make the objective lens and the eyepiece lie in a straight line, so it is often used in extremely compact binoculars. Prolen
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“It went down in one breath and it was obvious that the taste of the last glass of beer wasn’t quite right and it was sour.†The citizen Ma told reporters that 10 people had two boxes of beer and drunk more than one box. And Mr. Ma just got the bottle of beer that had a problem. “What wine is, a sour taste. A closer look reveals that there was a white precipitate in the beer.â€
The reporter observed the beer bottle on the spot and found that the brand of beer was Snow Beer, which was produced in Bengbu, Anhui province. The production date was November 23, 2011. The bottle mouth had obvious cracks, and the beer inside was very muddy. , and there is a clear white precipitate.
When Mr. Ma communicated with the manufacturer according to the contact information on the bottle, a staff member informed that Jining did not belong to the sales area of ​​the company's products. She would report this situation to the relevant department and then immediately hang it. phone. Afterwards, Mr. Ma negotiated with the hotel. After checking the bottle of wine, the hotel staff acknowledged the quality of the beer and returned them with a box of beer.
“Before receiving similar complaints, most of them were caused by lax seals.†A director Wang of the Association of Consumers in Jining City, after viewing the bottle of beer, believed that the cracks in the bottle mouth were rather old and should be beer manufacturers. There are defects in the recycling of bottles, and according to the date of production, it is estimated that due to the tight closure of the bottle into the air into the bottle, so that the beer bottle deterioration.
Compared with mirrors, roof prisms have two main shortcomings. One is the loss of light and the image is darker; the other is that it requires high assembly accuracy, which is difficult to manufacture, and the price is relatively expensive. A well-made roof prism can catch up in terms of performance. On but not more than Pro Prism.
The key to the roof prism lies in the existence of the roof surface. The so-called roof surface means that there is a roof-shaped reflecting surface sandwiched by two reflecting surfaces in the light path. The edges of the two surfaces are in the center of the light path, so some roof ridge prisms can see the middle. There is a dividing line, which can actually be understood as dividing the beam into two halves and then joining them together. The two mirrors form a right angle to form a roof surface. Try it yourself to see if the left and right sides of the ordinary mirror are interchanged? One of the most commonly used Biehan prism principles requires 6 reflections. Correspondingly, there is also an abbe prism commonly used in modern Zeiss telescopes, which is also a roof prism, which is slightly longer, but only needs 4 reflections and does not require a reflective layer, so the efficiency is higher than that of the Behan prism and the ordinary Paul prism. almost.
Snow Beer is now a white sediment consumer Association received multiple complaints
At noon on the 14th, the citizen Mr. Ma and his friends ate at a restaurant on Gujing Road in the urban area of ​​Jining. When they drank the last glass of wine, he felt that the beer in his glass was not very tasty. When he took the bottle, he opened it. When the bottle of "snow, snow, and snow" beer was discovered, the wine had become sour, and there was some white precipitate in the bottle.