Now take a limit in your second lens equation you have just written that will \"

Question

Now take a limit in your second lens equation you have just written that will "bring the two lenses in to cintact and then combining with the first lens equation shown that the finale image distances q_2 measured to the right of lens 2 is such that 1/p_1 + 1/q_2 = 1/f_1 + 1/F_2 What does this tell you about the 2-lens -in -contact combination ? write a sentances with a formula Based on your reading, design an astronomical telescope using a cardboard tube two tenses1. Lens 1 (Objective) focal length 45 cm, diameter 5 cm. Lens 2 (Eyepiece) focal length 5 cm, diameter 2 cm. Make a scale drawing of the completed telescope, indicating the dimensions.

Explanation / Answer

When we combine two lenses in contact the reciprocal of focal length of the combination is sumation of reciprocal of individual focal lengths.

If we have two lenses of focal lengt f1 and f2 the focal length of combination is

1/F = 1/f1 + 1/f2   

(Be sure the lenses should be in contact)

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