Question

2. A candle is placed in front of a concave mirror. The image of candle is formed on a wall at a distance of 2 m from the candle. The size of the image is 6 times that of the
candle. The distance of the candle from the mirror is
​

Answer 1

Answer:

infinite number of images can formed at the place of 2m from the candle

Answer 2

The distance of the candle from mirror is 34.3cm

Distance from candle = 2m (Given)

Size of image = 6 times (Given)

As the image is obtained on the wall, it will be a real image.

m = v/u = 6

v = u +2  

Therefore,  

u+2/u = 6

u +2 = 6u

5u = 2

= 0.4m or 40cm

Focal length = 1/f = 1/v-1/u

1/f = 1/40 - 1/240  

= -7/240

= 34.3cm

Thus, the distance from candle is 34.3cm