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  • A convex spherical mirror has a focal length of -20 cm. An object is placed 10 cm in front of the mirror on the mirror axis, where is the mirror located.Opt

A convex spherical mirror has a focal length of -20 cm. An object is placed 10 cm in front of the mirror on the mirror axis, where is the mirror located.

Option: 1

6.7 cm in front of the mirror


Option: 2

20 cm behind the mirror


Option: 3

6.7 cm behind the mirror 


Option: 4

20 cm in front of the mirror 


Answers (1)

As we learn

To find focal length of a convex mirror using convex lens -

PC= PI -R

f=\frac{R}{2}=\frac{PI}{2}

 f=-20 cm , u= 10 cm

\frac{1}{v}=\frac{1}{f}-\frac{1}{u}=-\frac{1}{20}-\frac{1}{10}=\frac{3}{-20}

v= \frac{-20}{3}cm=-6.7 cm

\therefore Image id 6.7 cm behind the mirror

 

Posted by

Ramraj Saini

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