Question

. A young boy can adjust the power of his lens
between 50 D to 60 D. If his far point is infinity,
then find his near point.​

Answer 1

Answer:

Solution :

a. When the eye is fuly relaxed, its focal length is largest and the power of the eye lens is minimum. This power is 50 D according to the given data. The focal lengts isAs the far point is at infinity, the parallel rays coming from infinity are focussed on the retiN/A in the fuly relaxed condition. HEnce, the distance of the retinN/A from the lens equals the focal length which is 2 cm. <br> b. when the eye is focussed at the near point, the power is maximum which is 60 D. the focal lenth in this case is1/v-1/u=1/f1/u=1/v-1/f=1/(2cm)-3/(5cm)u=-10cm

Explanation:

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