Physics, asked by nik5614, 1 year ago

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Answered by rudra09
3

ii) Thus the focal length of lens required for correctiom near vision is + 66. 7 cm. Plus sign of focal length tells us that it is convex lens.

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Answered by Anonymous
18

Answer:

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Explanation:

(i)  Power,P = -5.5 D , focal\:Length,f=?

∵  P=\frac{1}{f(in\:m)}

or\:-5.5=\:\frac{1}{f}

or\:f=\frac{1}{-5.5} =0.18m

The\:Negative\:(-)sign\:Indicates\:that\:the\:Lens\:is\:Concave

(ii) Power,P=+1.5D

Focal\:Length,f=?

∵   P=\frac{1}{f\:in\:m}

or\:+1.5=\frac{1}{f}

or\:f=\frac{1}{+1.5}

or\:f=+0.67

The\:positive\:sign\:indicates\:that\:the\:lens\:is\:Convex

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