Science, asked by manasi7126, 8 months ago

A doctor has prescribed a corrective lens of power +1.5D. Find the focal length of the lens. Is the prescribed lens diverging or converging ?

Answers

Answered by Anonymous

19

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Given,

Power of lens = +1.5D (D - dioptre)

Let the focal length be f.

$\huge\mathfrak\orange{Formula\:Used -}$

Power of lens = 1/focal length (in metres)

= 100/focal length (in centimetres)

$\huge\mathbf\red{Solution 1 :}$

1.5 = 100/f

=> f = 100/1.5

=> f = 1000/15

=> f = 66.67m

Focal Length = +66.67m

$\huge\mathbf\red{Solution 2 :}$

As,the focal length is positive, it is convex lens.So, the lens is convergent in nature.

The Prescribed Lens is Converging in nature.

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Answered by Anonymous

36

$\huge\star\underline\mathtt\blue{Answer:-}$ $<body bgcolor = lavender><marquee direction = "up"><font color = blue>$

Power of lens = +1.5D

So,

1.5 = 100/f

f = 100/1.5

f= 1000/15

f= 66.67m

Therefore,the prescribed lens is converging in nature.

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