Multiple Choice Questions on When an optician prescribes a ndash 5D lens what does it mean ........ for General Studies (Level 1) Preparation

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Multiple Choice Questions

When an optician prescribes a ndash 5D lens what does it mean ........

General Science (Easy) Physics
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When an optician prescribes a – 5D lens, what does it mean?

Concave lens of 20 cm focal length

Correct Answer

Convex lens of 5 cm focal length

Incorrect Answer

Concave lens of 5 cm focal length

Incorrect Answer

Convex lens of 5 cm focal length

Incorrect Answer
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Explanation:

Concave lens of 20 cm focal

-Negative sign shows that the lens is concave. Here,

P=−5D

∴f=1/P =−15m

=−0.2m

=−20cm

∴f=1/P =-15m

=-0.2m

=-20cm

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