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Grade: 10
        A person wears glasses of power – 2.5 D. Is the person farsighted or nearsighted? What is the far point of the person without the glasses?
5 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
							Sol. The person wears glasses of power –2.5D
So, the person must be near sighted.
u = ∞, v = far point, f = 1/-25 = - 0.4m = - 40 cm
now, 1/v – 1/u = 1/f
⇒ 1/v = 1/u + 1/f = 0 + 1/-40  ⇒ v = - 40 cm
So, the far point of the person is 40 cm

						
5 years ago
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