Experiment and computation prove that Ofter the beitrand lens enters into the micro-scopes optical path,t can change the whole microscope system into a telescopic system.

Experiment on selection of medium to inducing shoot for young Dendrocalamus brandisis by orthogonal design showed that 9 benzy-luminopourine (BA) could promote shoot formation, but α-naphtha-leneacetic acid inhibited; the best medium for shoot induction was Ms medium with 6.