From: Physics of everyday phenomena
Mac-Graw-Hill

9) An object is placed 20cm from a convex lens of 8cm focal length. Locate and describe the image.


10) A convex lens with a focal length of 6.0cm is held 4.0cm from an insect that is 0.50cm long.
A) Where is the image located

B) How large does the insect appear to be ?

11) In order to clearly read a book 25cm away, a farsighted person needs an image distance of -45cm from the eye. What focal length is needed for the lens.

12) A slide of an onion cell is placed 12mm from the objective lens of a microscope. The focal length of the objective lens is 10mm.
A) How far from the lens is the image formed ?
B) What is the magnification of this image?
C) the real image formed is located 10mm beneath the eyepiece lens. If the local length of the eyepiece is 20mm, where does the final image appear ?
D) What is the final magnification of this compound system?


13) discuss the optical device: microscope/


14) discuss the optical device:: the refractive telescope


 
15) explain what are gravity lenses.
REmember Einstein explained the bending of light in term of curvature of space.

 

© haplosciences 2000-2007 -
vente par correspondance jeux éducatifs,  jeux scientifiques clement o ni , jeux educatifs
Amina, Wanikou, mael r oi du mail , laboratoire chimie, fiches e xperiences,  thomas au temps des chevaliers, Pilou  la classe,
 fichiers animation les francas, jeux engrenages singes, engre nages juniors, engr e nages train safari, prismes
microscopes, p rismes, jeux gyzmo sous la mer, jeux engrenages, c o loriage, travaux manuels, animaux, sciences, vente prismes
tub es a essai, apprendre l a nglais , coloriae , anglais maternelle, jeux clémentoni, cahiers maternelle, anglais enfants, anglais petits