1.

The image of an object is at 10 cm from the con cave mirror if focal length of mirror is 15 cm then find the distance of object from mirror

Answer»

Answer:

first at concave mirror

u= -15u=−15 ; f= -10f=−10

\dfrac{1}{V}+\dfrac{1}{u}=\dfrac{1}{f}

v

1

+

u

1

=

f

1

\dfrac{1}{v}-\dfrac{1}{15}= -\dfrac{1}{10}

v

1

−

15

1

=−

10

1

v= -30v=−30

then at convex mirror

u= -10u=−10 ; f= +15f=+15]

\dfrac{1}{v}+\dfrac{1}{u}=\dfrac{1}{f}

v

1

+

u

1

=

f

1

\dfrac{1}{v}-\dfrac{1}{10}=\dfrac{1}{15}

v

1

−

10

1

=

15

1

v= 6v=6

i.e, image is formed at a distance 6cm6cm behind the mirror and it is VIRTUAL


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