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AIIMS 2007
Exam
AIIMS
Year
2007
Subject
Physics
Chapter
Ray Optics

AIIMS 2007 · Physics · Ray Optics

The camera lens has an aperture of f and the exposure time is ((1 /...

The camera lens has an aperture of ff and the exposure time is ((1 / 60) \mathrm{s}). What will be the new exposure time if the aperture become 1.4f1.4 f ?

Options

  1. A(\frac{1}{42})
  2. B(\frac{1}{56})
  3. C(\frac{1}{72})
  4. D(\frac{1}{31})

Correct answer

D. (\frac{1}{31})

Step-by-step solution

Time of exposure (\propto f^2) 160×11=t1.42⇒t=0.03266 st=131 s.\begin{aligned} & \frac{1}{60} \times \frac{1}{1}=\frac{t}{1.4^2} \Rightarrow t=0.03266 \mathrm{~s} \\ & t=\frac{1}{31} \mathrm{~s} . \end{aligned})$
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