Question

a blue object on a white background when seen though a blue filter will appear? ( a) invisible (B) blue on a white background (c) blue on red background (d) black on a blue background​

Answer 1

(B) Blue on a white background is the correct answer.

=> Blue objects absorb red and green light and reflect blue light.

=> White objects reflect blue, green and red light, so appear white.

=>  If blue object is seen through a blue filter, the blue object reflects blue light, this light passes through the blue filter   (which also reflects blue light) and reach our eyes, making the object still appear blue.