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प्रश्न
A beam of light is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the following figure:
The box contains:
विकल्प
a glass prism
a concave lens
a convex lens
a parallel-sided glass slab
MCQ
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उत्तर
A concave lens
Explanation:
The diagram shows that parallel light rays enter the box and spread outwards after emerging. A concave lens is a diverging lens that refracts parallel incident rays away from the principal axis, making them appear to diverge from a single focal point. The central ray passing through the optical centre travels straight without bending.
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