Question

How to find the focal length of a convex mirror using a convex lens readings

Answer 1

Materials Required:

Illuminated wire gauzeStandScreenMeter scaleConvex lensGiven convex mirror

Real Lab Procedure:

Place a convex lens on a stand facing the illuminated wire gauze at a fixed distance, say 30 cm, away from the wire gauze.Place a screen, at the other side of the lens so that the wire gauze, lens and screen are in a straight line.Adjust the position of screen to get a clear image of the wire gauze.Now fix the given convex mirror to another stand and place it in between the convex lens and screen with its reflecting face facing the wire gauze.Now place another side by side with the wire gauze.The position of the convex mirror is adjusted so that a clear image of the wire gauze is formed on the screen placed side by side with the wire gauze.Measure the distance between the mirror and first screen and take as the radius of curvature of the mirror R.                                            The focal length of the mirror is calculated as ,                                              Repeat the experiment by moving the convex lens towards the object by 2 cm each time and record the values in a tabular column.

Answer 2

Answer:

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Explanation:

To find the focal length of a convex mirror, using a convex lens.

Apparatus

An optical bench with four uprights (two fixed uprights in middle, two outer uprights with lateral movement), convex lens (20 cm focal length), convex mirror, a lens holder, a mirror holder, two optical needles, (one thin, one thick) a knitting needle, and a half metre scale