Question

Explain the procedure of an activity” to find the focal length of
a concave mirror

Answer 1

Answer:

Aim : To find the focal length of a concave mirror.

Apparatus required.: Concave mirror, a sheet of paper and meter scale.

Procedure :

• Hold a concave mirror perpendicular to the direction of sunlight.

• Take a small paper and slowly move it in front of the mirror and find out the point where you get smallest and brightest spot.

• This is the image of the sun.

• The rays coming from sun parallel to the concave mirror are converging at a point.

• This point is called focus or focal point (F) of the concave mirror.

• Measure the distance of this spot from the pole of the mirror.

• This distance is the focal length of the given concave mirror.

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