Concept explainers
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.
Answer to Problem 1CQ
Solution:
Exposure of camera becomes underexposed.
Explanation of Solution
We have Exposure =
And Intensity, I
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
PHYS 212 FOR SCI+ENG W/MAST PHYS >ICP<
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