2) You have a lens. Suggest an experiment to find out the focal length of the
Lens.
Answers
Answer:
Explanation: Place the white screen behind the lens such that the image of the object is formed on the screen. Now move the screen until you get a sharp, diminished & inverted image of the distant object. ... The difference between the lens mark & the screen mark will give the focal length.
Aim: To find the focal length of a given lens.
Apparatus: Object (candle), the convex lens, V-stand, screen.
Procedure:
Take a V-stand and place it on a long table in the middle.
Place a convex lens on the V-stand.
Imagine the principal axis.
Light a candle and ask your friend to take the candle far away from the lens along the principal axis.
Adjust a screen (prepared with paper placed perpendicular to the axis) which
is another side of the lens until we will get a point sized image.
Measure the image from V-stand of the lens.
This gives the focal length of the given lens because distant objects from the image on focus so the distance between image and lens is nothing but the focal length of the given lens.