ENRICHMENT OF FIRST DAILY TEST

1. A converging lens has a focal length of 15 cm. An object is placed 20 cm from the lens.
a. Determine the image (i.e. its position and whether it is real or virtual, upright or inverted) and find the magnification.
b. Draw a ray diagram to confirm your result.

2. A converging lens of focal length 10,0 cm is used as a magnifying glass. An object whose size is 1.6 mm is placed at some distance from the lens so that a virtual image is formed a distance of 25 cm in front of the lens.
a. What is the distance between the object and the lens ?
b. Where should the object be placed if the image is to form at infinity?
c. When the image is at infinity, find the angular size.

3. A refracting telescope has an eyepiece focal length of 3.0 cm and an objective focal length of 67.o cm.
a. What is the magnification of the telescope ?
b. What is its the length? (Assume that the final image is produced at infinity).