এখন লেনছৰ ফকাছ দৈঘ্য -১৫ চেমি লেনছখনৰ ক্ষমতা নিণয় কৰা লেনছখন কি প্ৰকাৰৰ?
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What is the power of a lens with a focal length of 15 cm?
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Answer:
What is the power of a lens with a focal length of 15 cm?
Explanation:
If you convert to and from dioptric power, the answer is straight-forward since dioptric powers add up. Power in diopters is defined as the reciprocal focal length in meters ( P = 1/f ). So +20cm is +0.20m or +5D (1/0.2= 5) and -15cm= -0.15m or -6.67D.
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