find the focal length of the lens shown
Answers
hey mate their is your answer.....
To measure the focal length of a converging (convex) lens. To measure the focal length of a converging (convex) lens. Using the formula: 1/u + 1/v = 1/f, the focal length f of the lens can be found.
hope it help you so mark my answer into brainliest ✌️ and follow me and say thank to me also
Answer:
To measure the focal length of a converging (convex) lens.
Using the formula: 1/u + 1/v = 1/f, the focal length f of the lens can be found.
Equipment needed:
A convex lens and stand,
A retort stand and clamp,
A ray box,
A sheet of white cardboard and a metre stick,
An illuminated object i.e. cross threads/ hairs.
Method:
Find an approximate value for the focal length by focusing an image of a distant object onto a sheet of paper. The distance from the object to the lens is its focal length approximately. Measure and record this distance.
Set up the equipment as in the diagram. The illuminated object should be a distance from the lens greater than the rough length found in step 1.
Adjust the position of the cardboard screen until the image of the cross hairs is in the sharpest focus possible and most clearly visible on it.
With a metre stick, measure the distance u (from the cross- hairs to the centre of the lens and then measure the distance v (from the real image on the screen to the centre of the lens). Record these values.
Change the value of u and repeat steps 3 and 4. Do this at least four more times. Some values of u should be chosen to give a diminished image and some to give a magnified one. (u and v are both interchangeable i.e. u and v can be switched around).
Now use the formula 1/u + 1/v = 1/f
Explanation:
Please mark me as the brainliest ✌️✌️
In which class do you study Arishfa?