Question

The focal length of the glass of a short- sighted person is 37.5 cm. Calculate the power of glasses and their nature.​

Answer 1

The person will use concave lens

Focal length= -37.5cm

Power of lens, P = $\frac{1}{f}$

P=$\frac{100}{37.5}$

P=2.666....

P≈2.67D

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Answer 2

D=1/f

D=1/0.375 ( since 37.5 cm= 0.375 cm)

D= -2.7m

nature: concave lenses