Question : Select the most appropriate meaning of the given idiom.
True colours.

Option 1: Black and white.

Option 2: Light colours.

Option 3: Real character.

Option 4: Bright colours.

Question : The purpose of an optical filter is to___________.

Option 1: reflect lights of different colours

Option 2: dispense light into component colours

Option 3: refract the light of different colours

Option 4: transmit or absorb light of different colours