Question

01.
A real object is placed at such a distance from a concave mirror of focal length
ſ that the image is virtual, erect and twice the size of the object. Distance of the
object from the centre of curvature of the mirror is:
1.0/2
2.1
3.3f/2
4.None of these​

Answer 1

Explanation:

Given, u=−10cm,R=15cm,∴f=

2

R

=−

2

15

cm

From mirror formulae,

v

1

+

u

1

=

f

1

⇒

v

1

=

f

1

−

u

1

⇒

v

1

=

10

1

−

15

2

⇒v=−30

Nature of image is real and inverted.