Explanation:
Correct option is A)
According to new cartesian sign convention,
Object distance, u=−15 cm
Focal length of the concave mirror, f=−10 cm
Height of the object, h
0
=2 cm
According to mirror formula,
v1 + u1 = f1
⇒ v1= f1 − u1= −10 1 − 1−51 =
−10 1 + 151
or v=−30 cm
The image is formed at a distance of 30 cm from the mirror on the same side of the object.
It is a real image.
Magnification of the mirror, m=
u−v = h 0h 1
⇒ −15−(−30)= 2h 1
⇒h I
=−4 cm.
Negative sign shows that image is inverted.
The image is real, inverted, of size 4 cm at a distance of 30 cm in front of the mirror.
