You are provided with the following apparatus.

• a Convex lens
• A candle
• White screen
• Lens holder
• Metre rule
• Set up the apparatus as shown in the figure below.

1. Place a lighted candle at object distance, U = 20cm. Move the screen, towards or away the lens until a sharp image of the candle flame is obtained on the screen. Measure the distance V and record the results in the table below.
2. Repeat the same for other values of U as shown in the table and fill their respective values of V. (5mks)
3. Plot a graph of UV (cm2) against (U + V) (cm)
Determine the slope of the graph

Determine the power of the lens used in the experiment.

Part B

You are provided with the following apparatus

• 2 New dry cells
• An ammeter
• A mounted wire labelled AB
• A cell holder
• A switch
• Connecting wires
• Draw a circuit that can be used to determine the resistance of the wire AB.

Calculate the resistance of the wire

Object distance U (in cm)	Image distance V(in cm)	U + V (cm)	UV (cm2)
20
30
45
60
75
90

Candle U Convex lens White Screen