A far sighted person can see object beyond 49 cm clearly. If separation between glasses and eye lens is 1 cm, then find focal length of glass :-

Question

A far sighted person can see object beyond 49 cm clearly. If separation between glasses and eye lens is 1 cm, then find focal length of glass :- (A) 30 cm (B) 25 cm (C) 24 cm (D) 48 cm

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/9f1cf4f6af489c17913e41c9e37e0521-.png" /> (1/f)=(1/v)-(1/u)=(1/-48)-(1/-24) f=48 cm

Q. A far sighted person can see object beyond $49 c m$ clearly. If separation between glasses and eye lens is $1 c m$ , then find focal length of glass :-

30 cm

25 cm

24 cm

48 cm

$\frac{1}{f} = \frac{1}{v} - \frac{1}{u} = \frac{1}{- 48} - \frac{1}{- 24}$
$f = 48 c m$

Q. A far sighted person can see object beyond 49cm clearly. If separation between glasses and eye lens is 1cm, then find focal length of glass :-