Physics
Grade-10
Easy
Question
The radius of curvature of a lens is 1 m. The power of this lens is ____ D.
- 2
- 0.5
- -2
- -0.5
Hint:
formula of focal length and power of lens.
The correct answer is: 2
The radius of curvature of a lens is 1 m. The power of this lens is 2D.
focal length = radius of curvature/2=1/2=0.5m
power= 1/focal length= 1/0.5=10/5=2m
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