Question

If the candle is placed at a distance of 100 cm from the screen and a three times magnified image of a candle flame is formed, then find out where the candle is placed also calculate power of the lens.(Given lens is convex) ​

Answer 1

Answer:

candle is places at 100 cm, it's image is formed 300cm (at the right side of lens I.e -ve) and Power of lens is -75 cm.

Explanation:

m= v/u

3=v/-100

v= -300cm

f= uv/u+v

= -100 × -300

_____________

-100 -300

= 30000

________

-400

= - 75 cm.