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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