Student Workbook for Physics for Scientists and Engineers: A Strategic Approach, Vol 1. (Chs 1-21)
Student Workbook for Physics for Scientists and Engineers: A Strategic Approach, Vol 1. (Chs 1-21)
4th Edition
ISBN: 9780134110646
Author: Randall D. Knight (Professor Emeritus)
Publisher: PEARSON
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Chapter 35, Problem 1CQ
To determine

Whether the exposure of a camera will become overexposed, underexposed or same if the focal length is changed to 16 mm without changing the diameter of the lens aperture. The correct exposure is when the focal length is 8 mm.

Expert Solution & Answer
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Answer to Problem 1CQ

Solution:

Exposure of camera becomes underexposed.

Explanation of Solution

We have Exposure = IΔtshutter, where I is the intensity and Δtshutter is the shutter time.

And Intensity, I D2f2, where D is the diameter of the lens aperture and f is focal length.

Here D is same and f is changed from 8 mm to 16 mm

➩ Intensity reduces, since Intensity inversely proportional to square of focal length

If intensity reduces exposure also reduces, since exposure is directly proportional to Intensity.

➩ So, the exposure of camera becomes underexposed.

Conclusion:

How the camera exposure is changed when the focal length is increased is found out.

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Chapter 35 Solutions

Student Workbook for Physics for Scientists and Engineers: A Strategic Approach, Vol 1. (Chs 1-21)

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