Question

Raj focussed the image of a candle on a white screen using a convex lens He noted down the position of the candle, screen and lens as under:
Position of candle = 12cm
Position of convex lens =50cm
Position of screen=88cm
☘What is the focal length of the convex lens?
☘ Where will the image be formed if he shifts the candle towards the lens at a position of 31cm?
☘ draw a ray diagram to show the formation of the image in case 2​

Answer 1

Answer:

If the student shifts the candle towards the lens at a position of 31.0 cm, object distance u=(50 -31) =19cm.Thus, candle lies at the focus. Hence, image will be formed at infinity.