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The type of glass used in making prisms and lenses is

A. Pyrex glass

B. Soft glass

C. Flint glass

D. Jena glass

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  19. Lightening cause rainfall because
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  21. Brass gets discoloured in air due to the presence of which gas in air
  22. The recent atomic weight scale is based on
  23. According to Daltons atomic theory the smallest particle which can exist independently is
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