Question

Answers for both a and b​

Answer 1

a) The image formed is laterally inverted

The image formed is virtual.

The image formed is erect.

The image distance is equal to the object distance.

b) h = 5cm

u= -20cm

f= -30cm

$\frac{1}{f} = \frac{1}{u} + \frac{1}{v } \\ - \frac{1}{30} + \frac{1}{20 } = \frac{1}{v} \\ \frac{ - 2 + 3}{60} = \frac{1}{v } \\ \\ \frac{1}{60} = \frac{1}{v } \\ v = 60cm$

$m = \frac{ - v}{u} \\ m = \frac{ - 60}{ - 20 } \\ m = 3 \\ m = \frac{h1}{h } \\ 3 = \frac{h1}{5 } \\ h1 = 15cm$

Answer 2

a)The characteristics of the image formed by plane mirror are:-

1-same size

2-upright

3-same distance from the mirror as object in front of the mirror

4:-virtual

b)Given, height of the object=5cm, u= -20cm, f= -30cm.

1/f=1/v+1/u

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

1/v= 1/60

v=60cm.

h2/h1= -v/u

h2/5= -60/-20

h2=15cm.