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Question 6 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 diffraction pattern consisting of a central bright fringe with parallel secondary fringes that decrease in intensity with increasing distance from the center of the screen?

Select an Answer

The figure 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: 
No

The figure 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 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 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: 
Yes

The figure 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 the opaque card with the slit. It provides an obstruction that would yield the single-slit diffraction pattern described.

Question Difficulty: 
medium