1. In what direction does light travel?

• Light travels along straight lines.

1. What acts as a mirror?

• Any polished or shining surface acts as a mirror.

1. What is a real image?

• An image that can be obtained on a screen is called a real image.

1. Define a virtual image.

• A virtual image is one that cannot be obtained on a screen.

1. Describe the characteristics of an image formed by a plane mirror.

• The image formed by a plane mirror is erect, virtual, and of the same size as the object. It is located at the same distance behind the mirror as the object is in front of it.

1. How is the orientation of the object and its image in a mirror related?

• In an image formed by a mirror, the left side of the object is seen on the right side in the image, and the right side of the object appears to be on the left side in the image.

1. What type of image can a concave mirror form?

• A concave mirror can form a real and inverted image. When the object is placed very close to the mirror, the image formed is virtual, erect, and magnified.

1. Describe the characteristics of an image formed by a convex mirror.

• An image formed by a convex mirror is erect, virtual, and smaller in size than the object.

1. What can a convex lens form?

• A convex lens can form a real and inverted image. When the object is placed very close to the lens, the image formed is virtual, erect, and magnified. When used to see objects magnified, the convex lens is called a magnifying glass.

1. What kind of image does a concave lens always form?
   • A concave lens always forms an erect, virtual, and smaller image than the object.
2. What is white light composed of?
   • White light is composed of seven colors.

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