Question

b.
A concave mirror of found length 0.3m is placed at a distance of 0.9m from a wall.
How far from the wall should on object be placed so as to get its real image on the
wall?​

Answer 1

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•A concave mirror of focal length 0.3m is placed at a distance of 0.9m from a wall.

How far from the wall should on object be placed so as to get its real image on the

wall?

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at a distance of (9/20)m from the wall

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━h

$<font color=red><marquee behavior=alternate>from the concave lens formula</marquee></font>$

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

$<font color=red><marquee behavior=alternate>Solution</marquee></font>$

given.......u=-0.9m; f=-0.3m

therefore..

$\frac{1}{ - 0.9} + \frac{1}{u} = \frac{1}{ - 0.3} \\ = > \frac{1}{u} = \frac{1}{0.9} - \frac{1}{0.3} \\ = > u = - \frac{9}{20}$

now the distance of the of the object from the wall is.

$= 0.9 - \frac{9}{20} \\ = \frac{9}{10} - \frac{9}{20} \\ = \frac{9}{20} \: \: meter$

$<font color=green><marquee direction="Right">hope this help you$