Question

A converging mirror has a focal length of 30 cm. At what distance from the pole of the mirror should an object of height 5 cm be placed, so that a real image is formed 75 cm away from the mirror? Find the size and magnification of the image also.​

Answer 1

Answer:

Height of object, h

o

=5cm, object distance u=−30cm, focal length f=−20cm

Now, from mirror formula :

f

1

=

v

1

+

u

1

v

1

=

f

1

−

u

1

=

20

−1

+

30

1

=−

60

1

v=−60cm - image distance

Magnification, m=−

u

v

=−

−30

−60

=−2

Size of image, h

i

=m(h

o

)=−2(5)=−10 cm

Explanation:

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Answer 2

I will only tell the answer:

10cm