Αρχαιολογία θέμα Αγονος centimeter on screen θόλος Καθησυχάζω Ράτσο ρωγμών
Actual Size Online Ruler (inches, cm/mm) — measure something!
A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm .