Question

Q.3. 0.5. hence, we powUI UI LIU IU A certain person can see clearly at distance between 20cm and 200cm from his eye. What spectacles are required to enable him to see distant objects clearly and what will be his least distance of distinct vision when he is wearing them ? (HSEB] Soln:​

Answer 1

Explanation:

Here, distance of far point

. Therefore, to see distant objects clearly, he has to use concave lens of focal length <br>

<br> Power of this lens,

<br> Now, distance of near point of defective eye,

<br> and let

be the distance of distinct vision when he is wearing spectacles. <br> From

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