First slide

The optical instruments

Question

For the myopic eye, the defect is cured by

Moderate

A

Convex lens
B

Concave lens
C

Cylindrical lens
D

Toric lens

Solution

$In myopia, u = \infty, v = d = distance of far point By \frac{1}{f} = \frac{1}{v} - \frac{1}{u}, we get f = - d Since f is negative, hence the lens used is concave .$

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