# AIM<sp

MATERIALS REQUIRED

A convex lens, a lens holder, a white screen such as a wall or white painted board, meter scale, distant object.

THEORY

1. A ray of light passing through the first principal focus or appearing to meet at it emerges parallel to the principal axis after refraction.
2. Convex lens converges the incident parallel beam of light on the other side of the lens.
3. T image formed by the convex lens may be real or virtual, inverted or erect, diminished, the same size or magnified depending on the various positions of the object.
4. Focal length for the convex lens is positive while it is negative for the concave lens.
5. The lens behaves like a plane glass plate when it is kept in a medium whose refractive index is equal to that of the lens.

PROCEDURE

1. Choose any distant object like a tree or the sun as an object for the experiment.

2. Held the lens vertically inside a lens holder and lens must be kept in vertical position during the experiment.

3. Place a screen on the other side of the lens.

4. Obtain the image of tree/building on a white screen or wall. Move the lens to get a sharp image.

5. Using a meter scale, measure the distance from the lens to the screen.

6. Repeat this procedure by changing the object.

OBSERVATION AND CALCULATION

Mean value of the focal length = 13.25 cm

RESULT

The approximate focal length of a convex lens = 13.25 cm.

PRECAUTIONS

1. The lens should be kept vertical inside the lens holder.

2. While measuring the distance, the distance between the sharp image and the centre of the lens is to be measured.

3. The lens the screen must be at the same level.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :

What is meant by?Lakhmir Singh & Manjit Kaur - Physics

Define principal Science Lab Manual

A student wants tScience - Board Papers

Draw a ray diagraScience - Board Papers

If the focal lengLakhmir Singh & Manjit Kaur - Physics

In a convex spherLakhmir Singh & Manjit Kaur - Physics

Out of convex mirLakhmir Singh & Manjit Kaur - Physics

The focal length Lakhmir Singh & Manjit Kaur - Physics

A communications Lakhmir Singh & Manjit Kaur - Physics