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Grade: 11
        A simple microscope is rated 5 X for a normal relaxed eye. What will be its magnifying power for a relaxed farsighted eye whose near point is 40 cm?
5 years ago

Answers : (1)

Kevin Nash
askIITians Faculty
332 Points
							Sol. The simple microscope has magnification of 5 for normal relaxed eye (D = 25 cm).
Because, the eye is relaxed the image is formed at infinity (normal adjustment)
So, m = 5 = D/f = 25/f ⇒ f = 5 cm
For the relaxed farsighted eye, D = 40 cm
So, m = D/f = 40/5 = 8
So, its magnifying power is 8X.

						
5 years ago
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