o sursa luminoasa punctiforma se afla pe axul optic al unei lentile cu distanta focala f=3cm la distanta x1=4cm de centrul optic alacesteia . De cealalta parte, la d=3cm, se afla o lentila identica cu prima. Cele doua lentile au acelasi ax optic. Unde se va forma imaginea sursei de lumina?

the answer is a. at the equator

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

1. metals

2. metalloids only

3. nonmetals only

4. metals and metalloids

5. metalloids and nonmetals

i just took this assignment so this is correct