Question

A student while obtaining a diminished real image of 5 cm object using a concave mirror of focal length 30 cm kept the mirror at 10 cm pointer on a meter scale and object 90 cm pointer.
state the position of the image with respect to the meter scale and also find the magnification and size of image​

Answer 1

Answer:

The position of the image is 5 cm behind the image..

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Answer 2

ANSWER

Given,

Focal length, f=−30 cm if u=−x

real ⇒ same side ⇒v=−ve

Magnification, m=

u

v

⇒v=m×u=3×(−x)=−3x

From mirror formula,

f

1

=

v

1

+

u

1

We get

−30

1

=

−3x

1

+

−x

1

⇒

30

1

=

3x

1+3

⇒

4

3x

=3⇒x=40 cm

So object should be placed at 40 cm to the mirror.