How Does a Camera Work? | A2 ESL Science Reading Passage

Use this A2-B1 ESL science reading passage to learn how a camera works. It includes key vocabulary, reading comprehension questions, and answers for English learners.

A camera uses light, a lens, and a sensor to make a picture.

Reading Level

A2-B1

Word Count

237 words

Reading Passage

A camera is a tool that saves a moment as a picture. Cameras can be large, small, or inside a phone. They all need light to work.

When you take a photo, light comes from the scene in front of you. The light may come from the Sun, a lamp, or another source. This light bounces off people and objects, then enters the camera.

Inside the camera, the light passes through a lens. The lens bends the light and helps bring it together. This makes the picture clearer.

A camera must focus the light. If the focus is wrong, the photo may look blurry. If the focus is right, the main subject looks sharp.

In a digital camera, the light reaches a sensor. The sensor changes the light into electronic information. The camera then uses this information to make an image.

Old film cameras worked in a different way. They used film that changed when light touched it. Today, many cameras use digital sensors instead of film.

A phone camera works in the same basic way. It uses a tiny lens, a small sensor, and computer tools to make a photo.

A camera works by collecting light, focusing it, and recording it. That is how a short moment becomes a picture we can keep.

Light enters the lens, focuses, and reaches the sensor.

Key Vocabulary

Word	Meaning	Example
camera	a tool that takes pictures	A camera can save a family photo.
lens	a curved piece of glass or plastic that bends light	The lens helps make the picture clear.
focus	to make an image clear	The camera can focus on a face.
sensor	a part that records light in a digital camera	The sensor records the light.
image	a picture	The camera makes a digital image.

Reading Comprehension Questions

1. What does a camera need to work?
2. What does the lens do?
3. What happens if the focus is wrong?
4. What does a digital sensor record?
5. How does a phone camera work in a basic way?

Answers

1. A camera needs light to work.
2. The lens bends light and helps bring it together.
3. The photo may look blurry.
4. A digital sensor records light.
5. It uses a tiny lens, a small sensor, and computer tools.

Short Summary

A camera uses light, a lens, and a sensor to make a picture. The lens focuses the light so the image can look clear.

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