Physics
Grade-10
Easy
Question
Mona wears a pair of eye lenses of focal length 1.6 m. What is the power of the lenses?
- + 0.353 D
- + 0.625 D
- - 0.353 D
- - 0.625 D
Hint:
The power of lens is it's ability to bend light. This means it depends on the focal length.
The correct answer is: + 0.625 D
The correct option is b)+ 0.625 D.
- The power can be calculated by reciprocal of the focal length in meters.
f= 1.6m
Power = 1/f
power=1/1.6
power= +0.625 D
f= 1.6m
Power = 1/f
power=1/1.6
power= +0.625 D
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