What allows us to see non-luminous objects?

We see non-luminous objects because light reflects off them and enters our eyes.

Answer in your head, out loud, or on paper, then tap the card to flip.

What are the steps involved in seeing an object?

1. Luminous objects emit light rays.

2. These light rays reflect off non-luminous objects around us.

3. Some of the reflected light enters our eyes, allowing us to see.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is a pinhole camera?

A pinhole camera is a simple device used to form images using light.

Answer in your head, out loud, or on paper, then tap the card to flip.

How does a pinhole camera form an image?

Light travels from an object in straight lines through a small pinhole into the camera.

As light crosses over inside the camera, the image seen is upside down.

Answer in your head, out loud, or on paper, then tap the card to flip.

What do lenses do to light?

Lenses refract light rays that pass through them.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the role of the cornea in the eye?

The transparent cornea provides the main focusing in the eye.

Answer in your head, out loud, or on paper, then tap the card to flip.

What does the lens in the eye do?

The adjustable lens fine-tunes the focus for objects at different distances.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the function of the iris in the eye?

The iris controls how much light enters the eye.

Answer in your head, out loud, or on paper, then tap the card to flip.

What happens to the signals generated by light in the eye?

In the eye, these signals are detected by the retina and sent to the brain, allowing sight.

Answer in your head, out loud, or on paper, then tap the card to flip.

How do digital cameras represent images?

Digital cameras generate electrical charges representing the image.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the role of the retina in the eye?

The retina is light-sensitive and detects the signals generated by absorbed light.

Answer in your head, out loud, or on paper, then tap the card to flip.

What type of lens causes light to converge?

A convex lens causes light to converge (focus).

Answer in your head, out loud, or on paper, then tap the card to flip.

What are the two main components in the eye responsible for focusing light?

1. The transparent cornea provides the main focusing.

2. The adjustable lens fine-tunes the focus for objects at different distances.

Answer in your head, out loud, or on paper, then tap the card to flip.