Purbin

Purbini ody az linzai chamkunandai kutokhkonuna iborat ast. Purbinkhoi murakkab az yakchand linzai chamkunanda tashkil yoftaand. Hrsilshavii tasvir dar purbini ody dar rasmi 3.30.13 nishon doda shudaast.                                                                                                                                                 Jismi AV dar bayni linza va konuni on joygir ast. Dar purbin tasviri rostai kalonkardai mavhumi jism AV bo jashm dida meshavad.

Purbinro baroi mushohidai jismhoi khurd istifoda mebarand. Az purbin ustohoi soatsoz baroi tamiri on istifoda mekunand. Mavqei purbinro junon intikhob mekunand, ki masofa az on to tasvir ba masofai behtarini binish barobar boshad. Baroi chashmi solim /₆₆= 25 sm ast.

Kalonkuni purbin hamjun nisbati masofai behtarini binish bar masofai konunii on muayyan karda meshavad:

SAVOLHO BAROI TAKROR——————————————————Purbini masofai konuniash 5 sm andozai jismro 5 marotiba kalon mekunad. Purbinho andozai jismro to 25 marotiba kalon karda metavonand.

1. Az purbin bo kadom maksad istifoda mebarand?
2. Purbinho jand namud meshavand?
3. Purbinhoi ody az purbinhoi murakkab jy fark dorand?
4. Dar purbin tasviri jismro sozed.
5. Hangomi kor bo purbin onro dar kadom mavke nigoh medo- rand?
6. Kalonkunii purbin az ruyi kadom formula hisob karda mesha- vad?
7. Purbinho andozai jismhoro to jand marotiba kalon mekunand?

MA SHKI 25                            —— —                                     ■             —- ■=.

• Purbini masofai konuniash 2,5 sm andozai jismro jand marotiba kalon mekunad? (Javob: G= 10 marotiba)
• Dar purbin jism 8,33 marotiba kalon karda meshavad. Ma- sofai konunii purbinro muayyan namoed. (Javob: G= 3 sm)