Physics
Assertion (A): Mixing a red, green and blue light gives white light.
Reason (R): Red, green and blue are secondary colours.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Reflection of Light
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Answer
A is true but R is false
Explanation
Assertion (A) is true because when red, green, and blue lights are mixed in proper proportions, they combine to produce white light which is known as additive mixing of colours.
Reason (R) is false because red, green and blue are not secondary colours instead they are the primary colours of light.
Therefore, A is true but R is false.
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Related Questions
A red rose is seen in green light. It will appear:
- red
- blue
- yellow
- black
The primary colours are:
- Red, blue and yellow
- Magenta, yellow and cyan
- Red, Blue and cyan
- Blue, green and red
Assertion (A): A red rose appears red in white light.
Reason (R): This is because it reflects all colours of light and absorbs red colour.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Fill in the blanks:
(a) Angle of incidence = ……………
(b) The incident ray, the reflected ray and the normal lie ……………
(c) The image formed by a plane mirror is at a distance behind the mirror as …………… .
(d) The image formed by a plane mirror is …………… and …………… .
(e) We are able to see the objects around us due to …………… reflection.
(f) A …………… image cannot be obtained on a screen.
(g) One surface of mirror is made opaque by …………… it followed by a thin coating of paint of lead oxide.
(h) A plane mirror …………… reflect 100 percent light falling on it.
(i) The colour of an opaque object is the colour of light which it …………… .
(j) Magenta, cyan and yellow are the …………… colours.