[SWS10] Ray Tracing for Thin Lenses

1. Suppose that you are inserting a ruler in an aquarium filled with water. The distance to the ruler in water appears to be ________________.

• less than the actual distance

• equal to the actual distance

• more than the actual distance

2. You can use the sun's rays and a lens to start a fire. To do so, you should use ____________.

• a converging lens

• a diverging lens

• either a converging or a diverging lens will work if you use it correctly

3. Which of these ray diagrams is possibly correct for a thin glass lens in air?

• 
• 
• 
• 

4. A converging lens is used to project the image of an arrow onto a screen. If the arrow is farther away from the lens than its focal length, what kind of image is projected on the screen? Choose all that apply.

• real

• virtual

• upright

• inverted

• no image can be projected

5. A piece of black tape is now placed over the upper half of the converging lens. Which of the following is true?

• Only the lower half of the object (i.e., the arrow tail) will show on the screen.

• Only the upper half of the object (i.e., the arrow head) will show on the screen.

• The whole object will still show on the screen.

5. Light rays are converging to point 1. The lens is inserted into the rays with its focal point at point 1. Which picture shows the rays leaving the lens?

• 
• 
• 
• 

When a real object is placed just outside the focal point of a diverging lens, what kind if image is formed? Choose all that apply.

• diminished

• virtual

• upright

• inverted

• real

A diverging lens is often made of glass with two concave surfaces (as shown). If instead the same shape were filled with air, and it was placed in water which of the following statements is correct?

• Nothing acts as a lens inside water.

• It will act as a diverging lens.

• It will act as a converging lens.

• Not enough information given.