Question

Please Answer ASAP!!!
A person needs a lens of power -3.5 D for distant viewing. His doctor prescribes a correction of +0.5 D in the near vision section of his bi-focals.
(i) What's the focal length of the distant viewing part of his lens?
(ii) What's the focal length of the near vision section of the lens?

Answer 1

If focal length of the objective and eye-piece of a telescope are 10 cm and 4 cm respectively, what will be its magnifying power in

(i) normal adjustments,

(ii) adjustment where image of distance object is formed at D? Given D = 25 cm.

Solution:

Focal length of objective fo = 10 cm

Focal length of eyepiece fe = 4 cm

(i) In normal adjustment

Extra-Questions-for-class-10-Science- Human-Eye-and-Colourful-World-Q19

Answer 2

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