Balu observes that the minimum power of the eye lens is 40 D. If the far point of the normal eye is infinity. Answer the below questions by reading the above information.
1. What is the formula for radius of curvature in terms of focal length, f ?
(i) 4f
(ii) 2f
(iii) 3f
2. What is the diameter of the eye ball ?
(i) 5 cm
(ii) 6 cm
(iii) 2.5 cm
3. What is the focal length of the lens?
(i) 5 cm
(ii) 6 cm
(iii) 2.5 cm
4. What is the unit for measuring the power of the lens ?
(i) Dioptre
(ii) Millimeter
5. What is the formula for finding the focal length of the lens ?
(i) \(\frac1{P^2}\)
(ii) \(\frac{1}{P}\)
(iii) P
