A lighted candle is placed d1=28.2 cm in front of a converging lens of focal length f1=15.1 cm, which in turn is d2=49.5 cm in front of a second converging lens of focal length f2=10.4 cm.

Calculate the position of the final image (relative to the second lens)

What is the equivalent focal length for this two-lens system?

Question

A lighted candle is placed d1=28.2 cm in front of a converging lens of focal length f1=15.1 cm, which in turn is d2=49.5 cm in front of a second converging lens of focal length f2=10.4 cm.

Calculate the position of the final image (relative to the second lens)

What is the equivalent focal length for this two-lens system?

anonymous · Answer

attachment

roadjester · Answer

len's equation 
$$\huge \frac 1 f = \frac 1 p + \frac 1 q$$