1. Aden Harili Agnes Septiani Alvia Hamulatsari Anindhita Harwati Anton Wahyono

2. Presentation Proposal Telescope Star The materials to make telescope : 1. Timber 2. Carton 3. Lens 4. Nail 5. Glue 6. Pack suttle cock

3. How to make telescope : 1. Cut 3 timbers with the long 120 cm. 2. Arranged the 3 timbers for buffer the telescope. 3. Stick the carton to pack suttle cock agree with focus (Fob + Fok). 4. Cut the carton. 5. Stick on the timber. 6. Enter telescope in the stick. 7. Pair the lens in telescope.

5. Objective Lens : Distance shadow : 20 cm Distance object : 18 cm Diameter : 5 cm Okuler Lens : Distance shadow : 50 cm Distance object : 73 cm Diameter : 5 cm

6. Look for Objective Lens 1/f= 1/s + 1/s = 1/18 + 1/20 = 10/180 + 9/180 = 19/180 F= 180/19 = 9,47

7. Look for Okuler Lens 1/f= 1/s + 1/s = 1/73 + 1/50 = 50/3650 + 73/3650 = 123/3650 F= 3650/123 = 29,674 D = L ob + L ok = 9,47 + 29,674 = 39,144

8. ….Thank you for your attention, I hope that useful for us….