Image sensors and optical devices

What is the role of the microlens placed over each pixel of an image sensor?

  1. ATo separate light by color
  2. BTo block infrared light
  3. CTo collect light over each pixel and guide it efficiently to the photodiode
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Answer: C. To collect light over each pixel and guide it efficiently to the photodiode

Only part of each pixel's area is the photodiode that can receive light. The microlens collects the light falling on the pixel and directs it to the photodiode, increasing sensitivity. Separating colors is the job of color filters, and blocking infrared is the job of an IR-cut filter.

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