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State whether the following is true or false.
A red filter and a green filter stacked together transmit almost no light.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: B

Each transmits where the other absorbs, so almost nothing survives both. This is a direct demonstration of the multiplicative nature of filtering. Each transmits where the other absorbs. Almost nothing survives both filters.

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