Find the focal length of convex mirror using convex lens
Answers
Answered by
0
STEP 1: DETERMINE THE ROUGH FOCAL LENGTH OF THE CONVEX LENS: First of all we take a convex lens and determine its rough focal length by forming a real image of a distant object on a screen. The distance between the convex lens and the screen gives the rough focal length, since when the object is at infinity, the image formed by the convex lens is at its focus. This method is called the distant object method to estimate the focal length of a convex lens. The focal length of a concave mirror may also be estimated using this method. Now, as we know the approximate focal length of the convex lens, keep an object- an optical pin or a lit candle in front of the convex lens at a distance around 2 times the rough focal length determined and place a screen on the other side so as to form a real image of the object on it. This adjustment is done so as to make the distances involved quite manageable. When you get a clear and sharp image on the screen, mark the positions of the convex lens and the screen on the table. Place the convex mirror in between the screen and the lens without disturbing the position of the candle and the lens. Place the screen close to the candle. Carefully adjust the position of the convex mirror alone so that you get a sharp image on the screen which is now kept at the position of and along with the candle. Mark the position of the convex mirror now. The distance between the position of the convex mirror and the old position of the screen gives the radius of curvature of the convex mirror.
Attachments:
Anonymous:
hpe it help[s mark as brainliest
if u likes the ans
Answered by
0
Answer:
To determine focal length of a convex lens
Place the holder with the screen on the bench. The position of the screen should be such that the sharp image of the distant object is obtained on it. The difference between the position of the lens and the screen is equal to the focal length of the given convex lens.
Similar questions