Question

Suppose you want to observe an erect image of a candle flame using concave mirror of focal length 20cm. Find the range of object distance. Nature of image formed and draw the ray diagram​

Answer 1

object distance u will be <20cm

the nature of the image is virtual erect and enlarged

Answer 2

Explanation:

Dear Student,

Please find below the solution to the asked query:

to obtain an erect image the candle would have to be placed between the pole and the focus.

Then,

maximum distance = 19.99 cm

minimum distance = 0.001 cm

Now,

from the mirrors formula:

1/f = 1/u+1/v

1/−20 = 1/−19.99 + 1/v

1/v = 1/19.99−1/20

v = 39979.99 cm

If u = 0.001

1/f = 1/u+1/v

1/−20 = 1/−0.001 +1/v

v = 0.0001 cm

Thus range,0.0001 cm ≤v≤39979.99 cmThe other two charateristics are:The image is formed behind the mirror.The image formed is virtual.