Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: 3rd Term
Week: 3
Age: 15 years
Duration: 45 minutes
Subject: Photography
Curriculum Theme: Trade
Previous Lesson: Film Development: Meaning of Film Development And Methods.
Topic: FILM DEVELOPMENT
Subject Matter: Development materials, Development equipment, Equipment functions

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define film development.
List at least three materials used in film development.
Identify at least three pieces of equipment used in film development.
Explain the function of key development materials and equipment.

Affective Domain:

Appreciate the importance of proper film development techniques.
Show interest in the chemical processes involved in photography.

Psychomotor Domain:

Correctly identify common film development materials and equipment.
Demonstrate basic understanding of handling development equipment.

Participate actively in class discussions about film development.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Basic Technology (JSS 1-3) / Senior Secondary Education Curriculum for Trade Subjects.
State Unified Scheme of Work for Photography (SSS 1).
Any relevant Photography textbook for Senior Secondary Schools.
https://www.dummies.com/photography/film-camera-photography/film-developing-materials-and-equipment/
https://www.bhphotovideo.com/explora/photography/tips-and-solutions/how-to-develop-your-own-black-and-white-film

Instructional Materials

The teacher will teach this lesson with the aid of:

Developer bottle
Fixer bottle
Measuring cup/cylinder
Developing tank with film reel (if available)
Thermometer
Timer
Whiteboard and markers
Charts showing film development process

Rationale for the Lesson

This lesson helps pupils understand the essential chemical process that turns an exposed film into a visible image. It enables pupils to appreciate the technical aspects of photography beyond just taking pictures, which is important for those interested in pursuing photography as a skill or career.

Prerequisite/Previous Knowledge

Pupils are assumed to have prior knowledge of basic photography concepts such as cameras, film, and the idea of capturing images.

Lesson Content/Board Summary

FILM DEVELOPMENT

Definition of Film Development

Film development is the chemical process used to convert the latent (invisible) image captured on exposed photographic film into a visible, permanent image. This process involves a series of chemical baths that react with the light-sensitive emulsion on the film.

Development Materials

The following are essential materials used in film development:

Developer: A chemical solution that converts the exposed silver halide crystals on the film into metallic silver, forming the visible image.
Stop Bath: An acidic solution (often diluted acetic acid) that halts the action of the developer, preventing over-development and preserving image quality.
Fixer (Hypo): A solution that removes unexposed silver halide crystals from the film, making the image permanent and insensitive to further light exposure.
Washing Agent: Water used to thoroughly wash the film after fixing to remove all residual chemicals, which could otherwise degrade the image over time.

Development Equipment

The following are common equipment used in film development:

Developing Tank: A light-tight container used to hold the film and chemical solutions during the development process.
Film Reel: A spiral reel placed inside the developing tank, designed to hold the film without its surfaces touching, allowing chemicals to flow evenly.
Measuring Cylinders/Cups: Used for accurately measuring the volumes of chemical solutions.
Thermometer: Essential for monitoring and maintaining the correct temperature of the chemical solutions, as temperature significantly affects development time and results.
Timer: Used to accurately time each stage of the development process (developing, stopping, fixing, washing).
Agitator/Stirring Rod: Used to gently agitate the chemicals within the developing tank to ensure even development and prevent air bubbles.
Film Clips/Hangers: Used to hang the film to dry after the washing process.
Squeegee: A tool used to remove excess water from the film surface before drying, preventing water spots.

Functions of Equipment

Each piece of equipment plays a specific role in the film development process:

Developing Tank: Provides a dark environment for chemical processing.
Film Reel: Holds the film securely and prevents it from sticking together.
Measuring Cylinders/Cups: Ensures precise chemical dilution and volume.
Thermometer: Controls the chemical reaction rate by maintaining optimal temperature.
Timer: Manages the duration of each chemical bath for correct processing.
Agitator/Stirring Rod: Ensures fresh chemical contact with the film emulsion for uniform development.
Film Clips/Hangers: Supports the film during drying.
Squeegee: Removes surface water to avoid drying marks.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and reviews the previous lesson briefly. The teacher then asks pupils what happens to film after it has been exposed to light in a camera. The teacher introduces the topic “Film Development” as the process that makes the pictures visible.
Pupils’ Activity: Pupils respond to questions and listen attentively to the introduction.
Learning Point: Pupils are introduced to the concept of film development.

Step 2: Presentation of Film Development

Time: 7 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines film development, explaining that it is a chemical process that turns an invisible image into a visible one. The teacher writes the definition on the board.
Pupils’ Activity: Pupils listen, take notes, and ask questions for clarification.
Learning Point: Pupils understand the definition of film development.

Step 3: Presentation of Development Materials

Time: 8 minutes
Teaching Skill: Listing/Identification
Teacher’s Activity: The teacher lists and explains the essential materials used for film development (developer, stop bath, fixer, washing agent). The teacher shows examples of bottles for these chemicals if available.
Pupils’ Activity: Pupils identify the materials, listen to explanations, and take notes.
Learning Point: Pupils identify and understand the purpose of various development materials.

Step 4: Presentation of Development Equipment

Time: 8 minutes
Teaching Skill: Identification/Description
Teacher’s Activity: The teacher presents and describes various equipment used in film development (developing tank, film reel, measuring cylinders, thermometer, timer, agitator, film clips, squeegee). The teacher uses instructional materials to show these items.
Pupils’ Activity: Pupils observe the equipment, listen to descriptions, and note down the names.
Learning Point: Pupils identify and recognize different film development equipment.

Step 5: Presentation of Equipment Functions

Time: 7 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains the specific function of each piece of equipment mentioned in Step 4, emphasizing why each tool is important for the development process. The teacher may demonstrate how some tools are used (e.g., placing a film reel in a tank).
Pupils’ Activity: Pupils pay attention to the explanations and demonstrations, asking questions where necessary.
Learning Point: Pupils understand the functions of various film development equipment.

Step 6: Class Activity/Discussion

Time: 5 minutes
Teaching Skill: Collaborative Learning
Teacher’s Activity: The teacher divides pupils into small groups and asks them to discuss the importance of precise timing and temperature control in film development. The teacher moves around to guide discussions.
Pupils’ Activity: Pupils discuss in groups and share their findings with the class.
Learning Point: Pupils reinforce their understanding of the importance of control in film development.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define film development.
List three essential materials used in film development.
Mention two pieces of equipment used for film development.
Explain the function of a developer and a fixer.

Pupils’ Activity: Pupils answer orally and in writing.
Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the definition of film development, the materials, and equipment involved, and their functions. The teacher assigns homework: “Draw and label any three film development equipment.”
Pupils’ Activity: Pupils listen to the summary and copy down the homework.
Learning Point: Pupils consolidate their learning and receive an assignment.

Lesson Keywords

Film Development – The chemical process of converting a latent image on film into a visible one.
Developer – A chemical solution that makes the latent image visible.
Fixer – A chemical solution that makes the developed image permanent.
Developing Tank – A light-tight container for processing film.
Film Reel – A spiral inside the tank that holds the film.

Differentiation

For pupils who grasp concepts quickly, the teacher will encourage them to research different types of developers and their effects on film. For pupils who require more support, the teacher will provide simplified diagrams and one-on-one explanations of the equipment and materials.

Note for teachers using this lesson plan

Teachers should ensure that they have actual samples or clear visual aids of the development materials and equipment to make the lesson more practical and engaging. Safety precautions related to handling chemicals should be emphasized if a demonstration is planned.