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Shkiper50 [21]
3 years ago
13

1. The nearest distance of distinct vision of

Physics
1 answer:
Vedmedyk [2.9K]3 years ago
3 0

Answer:

The focal length of the lens is +30 and it is a convex lens.

Explanation:

Given that,

The nearest distance of distinct vision of  a hypermetropial person is 60 cm, v = -60 cm

The distance is reduced by 20 cm, u = -20 cm

We need to find the nature and focal length of the lens.

Let f be the focal length of the lens. Using lens formula,

\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}\\\\\dfrac{1}{f}=\dfrac{1}{(-60)}-\dfrac{1}{(-20)}\\\\f=+30\ cm

So, the focal length of the lens is +30 and it is a convex lens.

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PLEASE ANSWER FAST In which of the following situations is the greatest amount of work accomplished? 1. A boy lifts a 2-newton b
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Explanation:

Work done is given by the product of force and displacement.

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A trampoline spring has a force constant k = 800 N/m and is stretched exactly 17.5cm. What is the energy required to do this?
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Answer:

the energy required for the extension is 12.25 J

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Given;

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