物理技巧

HKDSE Physics Assessment Framework 物理考試評核大綱

MODE OF ASSESSMENT
The public assessment of Physics consists of a public examination component and a school-based
assessment component as outlined in the following table:
Component Weighting Duration
Public
Examination
Paper 1 Questions set on Compulsory Part 60% 2 hours
30 minutes
Paper 2 Questions set on Elective Part 20% 1 hour
School-based Assessment (SBA) 20%
PUBLIC EXAMINATION
Paper 1 comprises two sections A and B. Section A consists of multiple-choice questions and carries
21% of the subject mark. Section B includes short questions, structured questions and an essay
question, and it carries 39% of the subject mark. Candidates have to attempt all questions in
Paper 1.
Paper 2 contains multiple-choice questions and structured questions set on each of the four elective
topics of the curriculum, and questions on each elective carry 10% of the subject mark. Candidates
are to attempt questions from any two of the four electives.
SCHOOL-BASED ASSESSMENT (SBA)
School-based assessment (SBA) is compulsory for all school candidates. Candidates will be assessed
by their teachers on their performance of a wide range of skills involved in practical work throughout S5
and S6. Candidates are required to perform a stipulated amount of practical work. The work should
be integrated closely with the curriculum and form a part of the normal learning and teaching process.
Candidates may also be required to design and conduct an investigative study with a view to solving an
authentic problem. They are expected to make use of their knowledge and understanding of physics in
performing such an investigative study, through which their generic skills, practical skills, process skills
and reporting skills, etc. would be developed and assessed.

折射率 Refractive index

折射率 Refractive index
Leave a Comment / 物理技巧 / By Martin Tong
折射率是指某一介質(Medium) 在光線進入的情況下的轉向比率.

這個比率越大意思就是指光線在折射後的折射角(法線 Normal和折射線之間的角度)越大

折射率的另一個意思是光速在真空狀態下的速度比光速在介質的速度

例如水的折射率是1.33

意思是指光速在真中狀態下比在這個介質情況下的 光速 快33

折射率可用以下的公式表示

n={\frac {c}{v}}

斯涅耳定律折射,n_1\sin\theta_1=n_2\sin\theta_2,其中 \theta_1和\theta_2是入射角和折射角,分別射線穿越折射率的兩種介質之間的界面的,n_{1}和n_{2}。折射率還決定了反射的光量到達界面時,以及全內反射和布魯斯特角的臨界角。