Question

$\red{QUESTION}$
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

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

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power , p = 1 \ f

+1 .5 = 1/f

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f = 1/+1.5 m

f = + 1/1.5 * 100cm

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focal length of the lens,

f= +66.7cm

Hope It Helps uhh~

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Answer 2

Answer:

Given,

Power, P=1.5D

focal length in metres, f=

P

1

f=

1.5

1

m

f=

3

2

m

=

3

2

×100

f=66.7cm

The power is positive, lens is convex i.e., converging