Aparatul este alcatuit din:
Microscop didactic (fara ocular);
Aparat de proiectie Diascol sau o lampa similara;
Suport din lemn.
Principiu de constructie: se demonteaza ocularul impreuna cu tubul de sustinere si se aseaza partea de microscop ramasa in pozitie culcat, astfel ca fanta de lumina a lampii proiectoare sa focalizeze pe preparatul microscopic, asezat pe masa mobila. Se fixeaza aparatul diascol (care indeplineste doar functia unei lampi) pe aceiasi axa optica cu a microscopului, iar in fata sa, se fixeaza microscopul pe suportul de lemn. Se va acorda o mare atentie fixarii celor doua aparate pe aceiasi axa, fapt care influenteaza calitatea imaginii. Masa mobila va trebui sa se miste pentru reglajul claritatii imaginii.Distanta optima de proiectie este pina la 3,5 m. Putem folosi ecran prin reflexie sau translucid (cind dispunem de o camera obscura).
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