a student wears spectacles of power -2d . what type of defect of the eye does the students have ? find the focal length of the lens used?
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If the power = -2 D
p = 100/f(cm)
-2 = 100/f
-2f = 100
f = 100/-2
f = -50
hence the focal length is -50cm
And the lens is used concave lens.
and he had myopia.
p = 100/f(cm)
-2 = 100/f
-2f = 100
f = 100/-2
f = -50
hence the focal length is -50cm
And the lens is used concave lens.
and he had myopia.
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