Someone help me answer these questions because I don\'tunderstand the concept. I

Question

Someone help me answer these questions because I don'tunderstand the concept. I hope someone can answer me thoroughly indetails so that I'll be able to explain it in my own words. Thankyou for your help in advance. 1. starting from equation 1, derive equation 3. Notice thatthe image formed by the first lens is the object of the second one,and englect the thickness of the lenses. (HINT: Show that when d=0,1/p1+1/q2=1/f1+1/f2) equation 1: 1/p+1/q = 1/f OR f=pq/(p+q) equation 3: 1/feq = 1/f1+1/f2 OR Deq = D1+ D2 2. An image of 5cm tall object is formed on a screen 20cm awayfrom a thin lens. The image is 2cm long Is the image upright orinverted? How far away from the lens is the object? What is thefocal length of the lens? (Remember that only a real imagecan be formed on a screen) Thank you for your help in advance. Someone help me answer these questions because I don'tunderstand the concept. I hope someone can answer me thoroughly indetails so that I'll be able to explain it in my own words. Thankyou for your help in advance. 1. starting from equation 1, derive equation 3. Notice thatthe image formed by the first lens is the object of the second one,and englect the thickness of the lenses. (HINT: Show that when d=0,1/p1+1/q2=1/f1+1/f2) equation 1: 1/p+1/q = 1/f OR f=pq/(p+q) equation 3: 1/feq = 1/f1+1/f2 OR Deq = D1+ D2 2. An image of 5cm tall object is formed on a screen 20cm awayfrom a thin lens. The image is 2cm long Is the image upright orinverted? How far away from the lens is the object? What is thefocal length of the lens? (Remember that only a real imagecan be formed on a screen) Thank you for your help in advance. 2. An image of 5cm tall object is formed on a screen 20cm awayfrom a thin lens. The image is 2cm long Is the image upright orinverted? How far away from the lens is the object? What is thefocal length of the lens? (Remember that only a real imagecan be formed on a screen) Thank you for your help in advance.

Explanation / Answer

2) Magnification of the lens is          M = -q/p =h'/h               - (20cm)/p = (2cm)/(5cm)              The object distance is p = -50cm The focal length of the lens is          1/f = 1/p +1/q Substitute the values for f.

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