Question

give the proper answer for the question number 21 for 10 CBSE in physics lesson human eye

Answer 1

Spectacles has a concave lens.
He is suffering from myopia .
power of lens(P) =
$\frac{1}{f} \: \: \: f \: is \: focal \: length \\ \frac{1}{ - 50cm} = - 0.02 \: diopter$

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Answer 2

hope u understand the calculations yourself