Question

the focal length of the concave mirror is 20 cm An object 5.0cm heigh is placed at a distance of 30 cm from the mirror.
calculate the 1) position and 2) size of the image formed​

Answer 1

Answer:

By using mirror formula and sign conventions of concave mirror

Answer 2

Answer:

1) image distance = -60cm

2)size of image formed = -10 cm

Step-by-step explanation:

height of the object=Ho=5cm, object distance=u= -30 cm , focal length = -20 cm

now, from the mirror formula: 1/f=1/v+1/u

1/v=1/f-1/u

= -1/20+1/30

= -1/60

v=-60 cm = image distance

magnification=m= -v/u= -60/-30= -2

size of the image =Hi =m(Ho)= -2(5)= -10cm

IMAGE DISTANCE=(-60) CM AND THE SIZE OF IMAGE=(-10)CM

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