Lens Refraction Quiz

Explain how light rays refract through a convex lens.

• Light rays refract through a convex lens by converging towards the principal axis and meeting at a focal point on the opposite side of the lens.

• Light rays refract through a convex lens by passing straight through without any change in direction

• Light rays refract through a convex lens by reflecting off the lens surface

• Light rays refract through a convex lens by diverging away from the principal axis and spreading out

Describe the refraction of light rays through a concave lens.

• Light rays refract through a concave lens by bending towards each other and crossing at the focal point.

• Light rays refract through a concave lens by passing straight through without any deviation.

• Light rays refract through a concave lens by diverging and appearing to come from a focal point in front of the lens.

• Light rays refract through a concave lens by converging and appearing to come from a focal point behind the lens.

How is the focal point of a lens determined?

• Color of the lens

• Weight of the lens

• Curvature of lens surfaces and refractive index of the material

• Thickness of the lens

Explain how an image is formed by a convex lens when the object is placed beyond 2F.

• A virtual and upright image is formed between F and 2F on the same side of the lens.

• No image is formed beyond 2F by a convex lens.

• A real and upright image is formed at 2F on the opposite side of the lens.

• A real and inverted image is formed between F and 2F on the opposite side of the lens.

What type of image is formed by a concave lens for an object placed at F?

• A real image is formed on the same side as the object

• A virtual image is formed on the opposite side of the object

• A magnified image is formed on the opposite side of the object

• No real image is formed, only virtual rays appear to diverge from the focal point on the same side as the object.

Calculate the focal length of a lens with a power of +8D.

• 0.5 meters

• 2 meters

• 12.5 meters

• 1.5 meters

Describe the image formed by a convex lens when the object is placed between F and 2F.

• The image formed is virtual, upright, and diminished.

• The image formed is real, inverted, and magnified.

• The image formed is real, upright, and magnified.

• The image formed is virtual, inverted, and magnified.