A camera uses a __________ to form an image on a piece of film at the back
A. Convex lens .
B. Concave lens
C. Diverging lens
D. All of these
When white light passes through a prism, it splits into __________ colors
A. 3
B. 5
C. 7
D. None of these
If we add all the 7 colours of rainbow (red, yellow, blue, green, orange, violet and indigo), the resultant colour would be?
A. White
B. Black
C. Maroon
D. All of these
Red + Green + Blue = ?
A. White
B. Black
C. Maroon
D. None of these