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Question 5 of 36

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SAT Subject Test

The set of lettered choices below refers to multiple questions.  Select the one lettered choice that best answers each question.  A choice may be used once, more than once, or not at all in each set.

The figure shows three arrows representing a light beam extending from left to right. The arrows approach a box with an opening on the left side. The right end of the box is completely open. To the right of the box is a screen.

A beam of light is incident on a rectangular opening in the front of a box, as shown in the side view above. The back of the box is open. After passing through the box, the light is incident on a screen. The following devices may be in the box, positioned as shown.

Which device could produce a tiny spot of light on the screen?

Select an Answer

The figure is labeled a convex lens and shows a thin lens in a box with a small opening on the left side. The right end of the box is completely open. The lens is thicker in the middle than at the edges.

Correct Answer: 
Yes

The figure is labeled a concave lens and shows a thin lens in a box. The box has a small opening on the left side, and the right end of the box is completely open. The lens is thinner in the middle than at the edges.

Correct Answer: 
No

The figure is labeled as a thick sheet of glass and shows a thick sheet of glass in a box. The box has a small opening on the left side, and the right end of the box is completely open. The glass sheet is in the shape of a parallelogram with a long side facing the small opening of the box. This long side of the parallelogram is angled slightly away from the box.

Correct Answer: 
No

The figure is labeled as an opaque card with a very narrow slit and shows an opaque card in a box. The box has a small opening on the left side, and the right end of the box is completely open. The card has a very narrow slit in the middle that separates the card into halves.

Correct Answer: 
No

The figure is labeled as a prism with vertex pointing down and shows a triangular prism in the box that has its vertex pointing downward. The box has a small opening on the left side, and the right end of the box is completely open.

Correct Answer: 
No

The correct answer is a convex lens. To produce a tiny spot of light, the optical device must cause the rays to converge and create a real image on the screen. Of the devices shown, only a convex lens can accomplish this.

Question Difficulty: 
medium