# AP (Advanced Placement) Physics(B-C): Questions 520 - 522 of 921

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## Question number: 520

### Question

In a diffraction experiment performed on a scale where the slit width is fairly large, the angle between bright lines for any set of bright lines becomes very small. In this situation, the diffraction equation, , can take on a simpler form. What is that form, and what is the reason it can be simplified?

### Choices

Choice (5) | Response | |
---|---|---|

a. | , Because is almost equal to for very small angles. | |

b. | , Because the ratio of to is very close to . | |

c. | , Because sin and tan are almost equal for very small angles. | |

d. | , Because when the angle is small, the functions are the same for all values of | |

e. | None of the above |

## Question number: 521

### Question

A convex lens of focal length is placed coaxially in constant with a concave lens of focal length . What is the power of the combination?

### Choices

Choice (5) | Response | |
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a. |
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b. |
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c. |
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d. |
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e. | Question does not provide sufficient data or is vague |

## Question number: 522

### Question

How much elongation of a wire long so that the strain is of ? if the wire has cross – section area of and is stretched by , then what is the stress?

### Choices

Choice (5) | Response | |
---|---|---|

a. |
| |

b. |
| |

c. |
| |

d. |
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e. | None of the above |