This lesson plan covers refraction through different refractive indices over two class periods totaling 90 minutes. Students will learn about refraction through problem-based learning activities like discussion, experimentation, and demonstrations. They will study refraction concepts like Snell's law through working in groups with a worksheet and presenting their findings. The goal is for students to understand and explain refraction phenomena qualitatively and quantitatively, and apply the principles to examples from daily life.

1. Lesson Plan 1st meeting
Refraction in Difference Refractive Index
Subject: Physics
Class/ Semester : X/II
Time Allocation : 2 x 45 minutes
I. Standard Competition
Applying work principle of optics.
II. Basic Competition
Analysis optics quantitatively and qualitatively.
III. Learning Model
Learning Model : Problem Based Learning
Learning Method : Direct, discussion, experiment, demonstration.
IV. Learning Source
1. Kanginan, Marthen. 2004. Fisikauntuk SMS kelas X semester 2 (page: 363-390). Jakarta.
Erlangga
2. Indrajit, Dudi. 2009. MudahdanAktifBelajarFisikauntukKelas X
sekolahmenengahAtas/Madrasah Aliyah (page: 116-125). Jakarta.
PusatPerbukuanDepartemenPendidikanNasional
3. Ryerson, Hill and others. No year. Physics 11 (page: 520-542). no city. no publishing.
V. Equipment
1. Glass
2. Water
3. Laser
4. Pencil
5. Plan parallel
6. Ruler
7. Light box ray
8. Protractor

2. VI. Learning Activity
Syntax Teacher activities Student activities Time allocation
Problem Recalling basic concept of Answer question from 10 minutes
Orientation light. teacher.
1. Why we look an object? 1. Because there is
Do demonstration applying light. Then object
concept of refraction reflected ray
Take a pencil to the water (light) to our eyes.
in glass Observe the
Tell problem to the demonstration from
students clearly. teacher.
1. Why the pencils look
separated each other?
Organized the Divided students in group Followed the teacher’s 5 minutes
students with each of group consist instruction.
of 4-5 students.
Giving student worksheet.
Guidance Guide student doing Doing experiment and 40 minutes
discussion experiment and discussion discussion about plan
based on worksheet. parallel lens based on
worksheet.
Presentation Choose two group to Make a report of group 20 minutes
the result of present their discussion discussion
discussion result. Present their result
Give occasion to the other experiment and
group give their oppinion. discussion
Evaluate Give evaluation of student Make a conclusion of 15 minutes
process and presentation. experiment and
result of Give correction if there is a discussion.
problem misconception. Solve the beginning

3. solving problem.
VII. Indicator
1. After experiment and discuss, student be able to define and explain refraction.
2. After experiment and discuss, student be able to define and explain index of refraction.
3. After experiment and discuss, student be able to explain cause of refraction.
4. After discussion, student can give example and explain a refraction phenomenon in daily life.
5. After experiment, student be able to explain Snell’s Law quantitatively and qualitatively.
6. After experiment and discuss, student be able to apply Snell’s Law in daily life.
7. After experiment and discuss, be able to calculate refraction ray and incident ray based on
the problem giving.