Question

a doctor has prescribed a corrective lens of power positive 1.5 D find the focal length of the lens is the prescribed lens diverging or converging ​

Answer 1

AnsWer :

• Focal length be +66.7 cm.
• Prescribed lens Converging.

Given :

• P = +1.5 D.

Formula Required :

$\tt \bullet \: p = \frac{1}{f}$

Here,

• P power of Lens.
• f focal length.

Solution :

$\tt \dashrightarrow P = \frac{1}{f}.$

$\tt\dashrightarrow + 1.5 = \frac{1}{f} .$

$\tt\dashrightarrow f = \frac{1}{1.5}$

$\tt\dashrightarrow f = \frac{100 \times 10}{15}$

$\tt\dashrightarrow f = \frac{200}{3}$

$\tt\dashrightarrow f = 66.7 \: cm.$

And,

Converging Lens Use.

Therefore, the value of focal be 66.7 cm. and lens be use Converging.

Answer 2

Answer:

HEY MATE, HERE IS UR ANSWER:-

power of the lens= +1.5D

Using P=100/f

f=100/f

f=100/1.5

=1000/15= 66.67m

As the focal length is positive, it is convex lens.

Hence, It is a converging lens.

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