In a dark room, a white light source shines a beam of light through a triangular hole to cast light on the screen. There is a translucent blue glass block between the triangular hole and the screen.

Which of the following image will be shown on the screen?

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Solution

The correct option is A
A colourful translucent object reflects as well as transmits the light of its own colour. In this case the wooden sheet would cast a black shadow except the triangular region through which the light will pass. Since the light of only blue colour will be able to pass, it would form a blue triangular patch on the screen as shown.

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In a dark room, a white light source shines a beam of light through a triangular hole to cast light on the screen. There is a translucent blue glass block between the triangular hole and the screen. Which of the following image will be shown on the screen?

In a dark room, a white light source shines a beam of light through a triangular hole to cast light on the screen. There is a translucent blue glass block between the triangular hole and the screen.

Which of the following image will be shown on the screen?