solve this
1/v-1/u=1/f
1/50-1/(-50)=1/f......
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ak9384491:
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1/v-1u=1/f
1/50-1/(-50)=1/f
1/50+1/50=1/f
1+1/50=1/f
2/50=1/f
1/25=1/f
f=25
hope it will help full to you
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