3) Lens

What is a lens?

• A transparent object that refracts light to form an image

• A device that emits light

• A material that absorbs light

• A surface that reflects light

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DOK Level 1: Recall

What is the primary characteristic of a concave lens?

• It converges light rays

• It diverges light rays

• It reflects light rays

• It absorbs light rays

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DOK Level 1: Recall

What is the primary characteristic of a convex lens?

• It converges light rays

• It diverges light rays

• It reflects light rays

• It absorbs light rays

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DOK Level 1: Recall

Which lens is also known as a converging lens?

• Concave lens

• Convex lens

• Diverging lens

• Cylindrical lens

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DOK Level 1: Recall

Which lens is also known as a diverging lens?

• Concave lens

• Convex lens

• Cylindrical lens

• Spherical lens

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DOK Level 1: Recall

How does a concave lens affect parallel light rays?

• It converges them to a point

• It diverges them outward

• It reflects them back

• It absorbs them

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DOK Level 2: Skill/Concept

How does a convex lens affect parallel light rays?

• It converges them to a point

• It diverges them outward

• It reflects them back

• It absorbs them

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DOK Level 2: Skill/Concept

Explain why a convex lens is used in magnifying glasses.

• Because it diverges light rays, making objects appear smaller

• Because it converges light rays, making objects appear larger

• Because it reflects light rays, making objects appear clearer

• Because it absorbs light rays, reducing glare

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DOK Level 3: Strategic Thinking

Describe the difference between a converging lens and a diverging lens in terms of their shape.

• A converging lens is thicker at the edges, while a diverging lens is thicker at the center

• A converging lens is thicker at the center, while a diverging lens is thicker at the edges

• Both lenses are thicker at the center

• Both lenses are thicker at the edges

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DOK Level 3: Strategic Thinking

How does the focal length of a concave lens compare to that of a convex lens?

• The focal length of a concave lens is positive, while that of a convex lens is negative

• The focal length of a concave lens is negative, while that of a convex lens is positive

• Both have positive focal lengths

• Both have negative focal lengths

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DOK Level 3: Strategic Thinking