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Oil left hardens, attracts dust, damages lens coating and can seep into objective. Clean with lens paper and xylene-free cleaner after each session, never use tissue.
Ref: NCERT Biology Laboratory Manual, Class XI, Mounting precautions and identification of artifacts.
10×100 = 1000x is maximum with light microscope. Beyond this empty magnification without gain in resolution.
Ref: NCERT Biology, Class XI, Practical guidelines for slide observation and field of view.
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