Question

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We Ne
2 Doctor has Prescribed a
has Prescribed a lens having
Power & 15 D. What will be the focal
length of the lens ? what is the type
of the lens and what must be
the defect of dision. ?
​

Answer 1

ANSWER

A lens having a power +1.5 D will have a focal length of

P =1/f

+1.5 D = 1/f

f = 1/1.5 = 2/3 = + 0.67 m.

The focal length is + 0.67m.

The nature of lens is converging type or convex lens.

The defect of the eye is Hyperopia or far-sightedness.

Explanation:

Power of lens p=+1.5D

p=  

f

1

​  

 

1.5=  

f

1

​  

 

f=  

1.5

1

​  

m

f=  

15

10

​  

m

f=  

3

2

​  

m=0.67m

Focal length of the lens is +0.67m.

The prescribed lens is converging in nature.

Answer 2

Explanation:

A lens having a power +1.5 D will have a focal length of

P =1/f

+1.5 D = 1/f

f = 1/1.5 = 2/3 = + 0.67 m.

The focal length is + 0.67m.

The nature of lens is converging type or convex lens.

The defect of the eye is Hyperopia or far-sightedness.

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