Physics
Grade-10
Easy
Question
The power of the glasses worn by Rishu is -3.5 D. What is the focal length of this lens?
- -0.285 m
- -3.5 m
- -0.364 m
- -2.85 m
Hint:
formula of power.
The correct answer is: -0.285 m
power= -3.5D=1/focal length
focal length = 1/ (-3.5) = -0.285m
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