Question

The focus of concave mirror is



Real

Virtual

None of above

​

Answer 1

REQUIRED FORMULA :

$\mapsto\sf \: \frac{1}{f} = \frac{1}{v} + \frac{1}{u}$

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SOLUTION :

$\: \: \: \: \: \: \: \: \: \: \sf \: \frac{1}{f} = \frac{1}{v} + \frac{1}{u}$

$\sf \implies \: \frac{1}{f} = \frac{1}{v} + \frac{1}{f}$

$\sf \implies \cancel{ \frac{1}{f} } = \frac{1}{v} + \cancel{ \frac{1}{f} }$

$\therefore \: \: \: \: \: \sf \: v = \:undefined$

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Hence,

$\mapsto{ \underline {\rm{Ans :}}} \: \sf \: \: \bull \: \: \: none \: of \: above$

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HOPE THIS IS HELPFUL...