സിനിമാ പ്രൊജക്ടറുകളിൽ ഉപയോഗിക്കുന്ന ദർപ്പണം ഏത്?
Aകോൺവെക്സ് ദർപ്പണം
Bകോൺകേവ് ദർപ്പണം
Cബൈഫോക്കൽ ദർപ്പണം
Dസിലിണ്ടറിക്കൽ ദർപ്പണം
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Related Questions:
An optical device Y has positive focal length. Y is?
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