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Fiesta28 [93]
2 years ago
9

Without his glasses, Isaac can see objects clearly only if they are less than 4.7 m from his eyes.

Physics
1 answer:
Mazyrski [523]2 years ago
6 0

Answer:

The focal length is  f  =  -4.721 \  m

Explanation:

From the question we are told that

  The  image distance  is  v  =  4.7 +  (2.1 *10^{-2}) =  - 4.721 \ m the negative means  image is formed behind the lens

Generally the object distance is  u  =  \infty this mean the light ray coming from the object are parallel to each other

So from lens equation

       \frac{1}{\infty } -   \frac{1}{4.721} = \frac{1}{f}

=>   f  =  -4.721 \  m

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