a concave mirror forms a virtual and ercet image at a distance of 30cm

1.	a concave mirror forms a virtual and ercet image at a distance of 30cm from the mirror when the object is held at 10cm in front of the mirror. calculate focal length of the mirror
Answer» Since the image is ERECT , so the magnification ratio must be positive . m=2 also u=−10cm so m=− u v 2=− −10 v v=20cm So the image is VIRTUAL and 20 CM from mirror on the other SIDE of the object.

a concave mirror forms a virtual and ercet image at a distance of 30cm from the mirror when the object is held at 10cm in front of the mirror. calculate focal length of the mirror

Answer»

Since the image is ERECT , so the magnification ratio must be positive .

m=2

also u=−10cm

so m=−

2=−

−10

v=20cm

So the image is VIRTUAL and 20 CM from mirror on the other SIDE of the object.