power of concave lens of 45 diopter find its focal length
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F is 100/45 cm
20/9 that is 2.88 cm.
20/9 that is 2.88 cm.
manavukani:
its 2.22
Answered by
3
focal length = 1/power = 100/45 = 2.22cm
could u elaborate!! unable to under stand how u did!!
focal length= reciprocal of power (1/power)
1/45 = 0.0222m
1m = 100cm so. 0.0222*100 = 2.22cm
i multiplied 100 in advance. both methods are same
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