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Here,
P1 = P (let) (converging power)
P2 = 20 D
Total Power of the combination P = P1 + P2
= 20+ P
Focal length of the combination = 1/(20+P) × 100 cm
= 100/(20+P)
Now
For minimum converging state of the eye lens object is at infinity
u = -∞
v = 5/3
f = 100/(20+P)
From Lens equation
1/f = 1/v -1/u
=> (20+P)/100 = 3/5 – 1/(-∞)
=> P = 40 D
Hope it helps
Regards
Arun(askIITians forum expert)
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