Doctor has prescribed a lens having power + 1.5. D . The focal length of this lens is ________
a) +0.5m
b) +0.67 m c)+0.5m d) +0.67cm
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Explanation:
power of lens is 1/f where f is the focal length
1.5= 1/f
f=1/1.5
f= 0.66666...
f= + 0.67 cm
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