An object looks red when seen through a piece of red glass. What is the actual colour of the object?

Red

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White

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Green

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Black

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Solution

The correct option is A Red
When a light of only one color (monochromatic light) is passed into prism that light suffers deviation only.
Now, coming to the question, both prism and slab are made of glass. When we see through glass slab there will be no variation in medium. Hence refractive index won't change. Hence color won't change and actual color appears. Since the object is appearing red, its color is red. Here the color of the slab doesn’t matter.

Hint: If an object is red in color, it means that it absorbs all other colors and reflects red color. Hence its color is red.

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