2022北美驯鹿数学思维挑战赛Caribou Contest报名开启！第一轮考试时间已公布
风靡29个国家，每年有16万中小学生同台竞技，全球统一排名，这是一项不专注于“难”题，而是通过“交互式”的新颖问题激发学生对数学的兴趣，提高解决问题能力的学术活动—北美驯鹿数学思维挑战赛。 学术活动简介 驯鹿...
Edexcel A Level Physics:复习笔记5.24 Plane Polarisation
Plane Polarisation Transverse waves can oscillate in any plane perpendicular to the direction of motion (and energy transfer) of the wave Such waves are said to be unpolarised Polarisation occurs w...
Edexcel A Level Physics:复习笔记5.23 Magnification
Magnification Magnification as a Ratio of Heights Magnification means how much larger the image is than the object This is the ratio of the image/object height Where: m = magnification hi = image ...
2022-23年滑铁卢数学竞赛报名开启，各比赛考试时间盘点！
超高含金量、具有悠久历史的加拿大滑铁卢国际数学学术活动是备受认可和关注的一项国际赛事。在高中阶段的同学们如果能在该学术活动中夺得不错的成绩，可以为申请大大加分！ 加拿大滑铁卢国际数学学术活动 加拿大...
Edexcel A Level Physics:复习笔记5.22 The Lens Equation
The Lens Equation This equation can be applied to all thin converging and diverging lenses The equation relates the focal length of the lens to the distances from the lens to the image and the obje...
Edexcel A Level Physics:复习笔记5.21 Real & Virtual Images
Real & Virtual Images Real Images Are formed when light rays from a point on an object pass through another point in space The light rays are really there Can be formed on a screen Are seen in ...
2022 COMC报名火热进行中，历年真题免费领取！
COMC(Canadian Open Mathematics Challenge)加拿大数学奥赛，又称加拿大数学公开赛，是由国际权威学术机构加拿大数学学会 (CMS) 举办。作为加拿大最具影响力的数学学术活动，每年参加人数高达上万，除此之外，COM...
Edexcel A Level Physics:复习笔记5.20 Thin Lenses in Combination
Thin Lenses in Combination When multiple lenses are used in series (one after the other) this is called a compound lens To find the total power of a compound lens, find the sum of the powers of the...
Edexcel A Level Physics:复习笔记5.19 Power of a Lens
Power of a Lens The power of a lens is a measure of its ability to refract light The more refraction a lens causes, the higher its power The power of a lens measures how strongly it focuses the lig...
Edexcel A Level Physics:复习笔记5.18 Using Ray Diagrams
Using Ray Diagrams Describing images formed by lenses Images are described using three concepts They are either: Real or virtual Bigger than, the same size as or smaller than the object Inverted or...
Edexcel A Level Physics:复习笔记5.17 Converging & Diverging Lenses
Converging & Diverging Lenses A lens is a piece of equipment that forms an image by refracting light There are two types of lens: Convex Concave Convex Lenses In a convex lens, parallel ...
Edexcel A Level Physics:复习笔记5.16 Measuring Refractive Index
Measuring Refractive Index Aim of the Experiment To investigate the refraction of light through a perspex block Equipment Ray Box - to provide a narrow beam of light to refract through the perspex ...
