Practice Question

1.Explain what a coloured filter will do.

A coloured filter is a transparent material, which absorbs some wavelengths of light, but allows other wavelengths of light to be transmitted. 

2. Suggest why it is essential that the filter is transparent and not opaque.

To allow light to pass through the filter. If the filter is opaque, no light will pass through the filter.

3. White light is directed at a blue filter, state the colour of the transmitted light

Blue

4a. Barry directed light through two filters. He sent a beam of white light through a red filter, the transmitted ray from the red filter was then shone through a blue filter. State what Barry would had observed.

The 1st filter will transmit red light

The 2nd filter will transmit no light

4b. Explain the observations in 4a

The first filter will absorb the wavelengths of light that correspond to blue and green, but transmit the wavelengths of light that correspond to red. 

The second filter will absorb the red wavelengths of light, so no light will be transmitted.