Question

doctor has prescribed to reema a lens having power + 1.5 D then a) what is her defect of vision ? b) what is the reason for this defect? c) what will be the focal of the lens? d) what is the type of the lens​

Answer 1

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Given :-

Power of lens is +1.5 D

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A.T.Q,

Ques(a) - What is her defect in vision ?

Ans - The defect in her vision is be " Hypermetropia ".

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Ques(b) - What is reason of this effect ?

Ans - The reason are :-

• The focal length of eye lens become too long .
• Eye ball become too small.

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Ques(c) - What will be focal length of the lens ?

Ans - As the Relationship between focal length and power of lens is :-

$\LARGE{\boxed{\boxed{\blue{\sf{F \: = \: {\frac{1}{P}}}}}}}$

F = 1/1.5

F = 0.6 m

$\large{\sf{F \: = \: 0.6 \: m}}$

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Ques(d) - What is this type of lens ?

Ans - The lens used is Convex Lens

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