Question

$\huge \mathfrak\red{QUESTION}$

A doctor has prescribed a corrective lens of power +1.5D. Find the focal length of the lens . is this prescribed lens diverging or converging. ​

Answer 1

Answer:

P = +1.5 D

Find out

We need to find out the focal length of the given lens

Solution

We know that

f = 1/P

Where,

f is the focal length

P is power

hope it helps you dear

f = 1/P

= 1/+1.5 = 0.67 m.

As the power of the lens is (+ve), the lens is converging

Answer 2

Answer:

$\huge\sf\blue{ANSWER}$

The power of this lens is positive ( with a + plus sign), therefore ,this is a convex lens or converging lens .

$now$

power , p = 1 \ f

+1 .5 = 1/f

$or$

f = 1/+1.5 m

f = + 1/1.5 * 100cm

$so$

focal length of the lens,

f= +66.7cm