When a yellow card is observed through a blue glass, the ...
When a yellow card is observed through a blue glass, the card would appear.
black
green
red
white
Correct answer is A
No explanation has been provided for this answer.
counting of currency notes with moist fingers is based on the principles of? ...
An object placed 10cm from a concave mirror of focal length 5cm would have its image ...
When an atom loses or gains a charge, it becomes an ...
Totally reflecting prisms are preferred to mirrors in periscopes because I. mirror givegive multi...