state gov UP Police Assistant Operator (Radio Cadre) Mock Test General Science Physics Optics

−4 डायोप्टर (D) की क्षमता वाले अवतल लेंस की फोकस दूरी क्या होगी?

1
50 सेमी 
2
-25 सेमी 
3
-50 सेमी 
4
25 सेमी 
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