Science, asked by raghuraghuds5486, 6 months ago

An object is placed in
is placed in front
front of a Concave mirror
of focal length 20 on the image formed 20 cm
the image formed is 3 times the size of object
cod malte two possible dostance of object from
mirror​

Answers

Answered by pkgsamar
1

Answer:

ANSWER

It is given that,

Focal length

f=−20cm

h

i

=3h

o

The image is three times the size of the object. So there are two cases.

Case 1. For real image

m=−

u

v

=−3

v=3u

Using mirror’s formula

f

1

=

v

1

+

u

1

−20

1

=

3u

1

+

u

1

u=

3

−80

cm

Case 2. For virtual image

m=

u

−v

=+3

v=−3u

Again using mirror’s formula

−20

1

=

−3u

1

+

u

1

u=

3

−40

cm

The possible values of u are

3

−80

cmand

3

−40

cm.

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