Question

Aconcave mirror has a focal length of 20 cm. If an object is placed at a distance of 30 cm from the
of the mirror then the image distance and transverse magnification are respectively
​

Answer 1

Answer:

Explanation:

concave mirror

have positive focal lenght so f=20 and u=-30 apply formula

1/u+1/v=1/f

sole for v

for magnification apply formula=-v/u

Answer 2

Explanation:

object distance u = -30cm

focal length f = -20cm

image distance v = ?

According to mirror formula

1/v + 1/u = 1/f

1/v = 1/f - 1/u

1/v = 1/-20 - 1/-30

1/v = 1/-20 + 1/30

1/v = 30-20/30×-20

1/v = 10/-60

1/v = -1/6

v = -6cm.

Magnification = - v/u

= -(-6)/-30

= 6/-30

= -0.2

HOPE IT HELPS ☺️.