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Case Base Question
Noor, a young student, was trying to demonstrate some properties of light in her Science project work. She kept ‘X’ inside the box (as shown in the figure) and with the help of a laser pointer made light rays pass through the holes on one side of the box. She had a small butter-paper screen to see the spots of light being cast as they emerged.
What could be the ‘X’ that she placed inside the box to make the rays behave as shown?
(A) a converging lens
(B) a parallel-sided glass block
(C) a plane mirror
(D) a triangular prism
Answer -
Since Ray coming inside X, and Ray Coming outside X are parallel.
- It means that emergent ray is parallel to incident ray
- This only happens when we use a glass block which has parallel sides.
So, the correct answer is (b)
