JEE MAIN - Physics (2023 - 30th January Morning Shift - No. 18)
A person has been using spectacles of power $$-1.0$$ dioptre for distant vision and a separate reading glass of power $$2.0$$ dioptres. What is the least distance of distinct vision for this person :
50 cm
40 cm
30 cm
10 cm
Explanation
u = 25 cm
$$f=\frac{1}{2}$$ m = 50 cm
$${1 \over v} - {1 \over u} = {1 \over f}$$
$$ \Rightarrow {1 \over v} + {1 \over {25}} = - {1 \over {50}}$$
$${1 \over v} = - {1 \over {50}}$$
$$ \Rightarrow u = - 50$$ cm
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