(i) एक लैंस की क्षमता + 4डायोप्टर है तो इसकी फोकस दूरी क्या होगी?
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Answer:
0.25m OR 25 cm
Explanation:
Given: Power of lens (D)= 4 dioptre
To find : focal length of lens
Formula: Power of lens= 1/ focal length ( metre)
i.e. D=1/f(m)
Solution: D= 1/f(m)
4=1/f(m)
f(m)=1/4
f(m) = 0.25
f=0.25m OR 25cm
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