Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: Second Term
Week: 1
Age: 15 years
Duration: 45 minutes
Subject: Photography
Curriculum Theme: Trade
Previous Lesson: .
Topic: THE FILM
Subject Matter: Meaning of film, Nature of film

Specific Objectives

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

Cognitive Domain:

Define photographic film.
Describe the nature and structure of a photographic film.
Identify the main layers of a photographic film.

Affective Domain:

Appreciate the importance of film in capturing images.
Show interest in learning more about photographic processes.

Psychomotor Domain:

Handle a film cartridge and strip carefully.
Point out the different layers of a film strip when observed.

Discuss the historical role of film in visual communication.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Cultural and Creative Arts (Photography Section)
State Unified Scheme of Work for Photography SSS 1
Adeola, J. (2018). Fundamentals of Photography for Senior Secondary Schools. Lagos: Excellent Books.
https://www.britannica.com/technology/photographic-film
https://www.kodak.com/en/company/history/photographic-film

Instructional Materials

The teacher will teach this lesson with the aid of:

An undeveloped film cartridge
A strip of developed film
A light box or projector for showing film structure
Charts illustrating film layers

Rationale for the Lesson

Understanding photographic film is essential because it is the fundamental medium for capturing images in traditional photography. This lesson helps pupils grasp how images are recorded, which is a core concept in photography and enables them to appreciate the technology behind visual records.

Prerequisite/Previous Knowledge

Pupils are assumed to have a basic understanding of what a camera is and that it is used to take pictures.

Lesson Content/Board Summary

THE FILM

Meaning of Film

A photographic film is a transparent plastic material coated with light-sensitive chemicals. It is used inside a camera to record images when exposed to light. The image formed on the film after exposure is called a latent image, which becomes visible after chemical processing.

Nature and Structure of Film

Photographic film is composed of several layers, each with a specific function in capturing and preserving an image.

The following are the main layers of a photographic film:

Base: This is the transparent, flexible plastic layer that provides the main support for the film. It is usually made of cellulose triacetate or polyester and gives the film its strength and stability.
Emulsion Layer: This is the most important layer, containing light-sensitive silver halide crystals (e.g., silver bromide, silver chloride) suspended in gelatin. It is the part of the film that reacts to light to form the latent image.
Anti-halation Layer: This layer is usually found on the back of the film base or sometimes between the base and the emulsion. Its purpose is to absorb light that passes through the emulsion and base, preventing it from reflecting back into the emulsion and causing blurring or halos around bright areas.
Supercoat/Protective Layer: A thin, clear layer of hardened gelatin placed over the emulsion. It protects the delicate emulsion layer from scratches, abrasion, and chemical damage during handling and processing.

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 asks them what they think is inside a camera that helps it capture pictures. The teacher then introduces the topic, “The Film.”
Pupils’ Activity: Pupils respond to the questions and listen attentively to the introduction.
Learning Point: Pupils are prepared for the lesson and recall prior knowledge.

Step 2: Meaning of Film

Time: 10 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher explains the meaning of photographic film, defining it as a light-sensitive material used to record images. The teacher also explains the concept of a latent image.
Pupils’ Activity: Pupils listen, take notes, and ask questions for clarification.
Learning Point: Pupils understand the definition and basic function of photographic film.

Step 3: Nature and Structure of Film

Time: 15 minutes
Teaching Skill: Demonstration/Explanation
Teacher’s Activity: The teacher explains the nature of film as a multi-layered material. Using charts, a developed film strip, and a light box, the teacher identifies and explains each layer: the base, emulsion layer, anti-halation layer, and supercoat, detailing their respective functions.
Pupils’ Activity: Pupils observe the film materials and charts, listen to the explanations, and take notes on the different layers and their functions.
Learning Point: Pupils identify and understand the structure and purpose of each layer of a photographic film.

Step 4: Practical Observation

Time: 5 minutes
Teaching Skill: Observation/Guided Practice
Teacher’s Activity: The teacher passes around an undeveloped film cartridge and a strip of developed film for pupils to observe, emphasizing careful handling. The teacher guides pupils to identify the transparent base and the coated emulsion side.
Pupils’ Activity: Pupils carefully observe the undeveloped film cartridge and the film strip, trying to identify the different physical parts and layers as explained by the teacher.
Learning Point: Pupils get a practical feel for photographic film and its components.

Step 5: Discussion and Questions

Time: 5 minutes
Teaching Skill: Questioning/Reinforcement
Teacher’s Activity: The teacher facilitates a brief discussion, asking pupils to recall the functions of specific layers and answering any questions they might have about the film.
Pupils’ Activity: Pupils participate in the discussion, ask questions, and contribute answers, clarifying their understanding.
Learning Point: Pupils consolidate their understanding through active participation.

Step 6: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define photographic film.
List three main layers of a photographic film.
State the function of the emulsion layer in a film.
What is the purpose of the anti-halation layer?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 7: Conclusion

Time: 5 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the meaning of film and its layered structure. The teacher also gives pupils an assignment to research different types of film (e.g., black and white, colour).
Pupils’ Activity: Pupils listen to the summary and copy the assignment.
Learning Point: Pupils have a clear understanding of the lesson and are prepared for future learning.

Lesson Keywords

Film – A transparent plastic material coated with light-sensitive chemicals used to record images.
Emulsion – The light-sensitive layer of a film, containing silver halide crystals.
Base – The transparent, flexible support layer of the film.
Anti-halation – A layer in film that prevents light from reflecting back into the emulsion.
Supercoat – A clear protective layer over the emulsion.
Latent Image – The invisible image formed on film after exposure to light.

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to explain the chemical reaction involved in film exposure. For pupils needing more support, the teacher will provide simplified diagrams and allow for peer support during the practical observation of film strips.

Note for teachers using this lesson plan

Ensure that the film materials used for demonstration are not exposed to direct sunlight for prolonged periods to avoid further damage. Encourage pupils to handle the film with care, as it is fragile. Emphasize the historical significance of film in photography before the digital era.