The chemical name of 'solar cell' material commonly used is
A. Copper oxide
B. Selenium
C. Germanium
D. Silicon
Answer: Option D
Solution (By JKSSB Mock Tests)
Most solar cells use silicon (monocrystalline or polycrystalline). Other materials: gallium arsenide, cadmium telluride. Silicon is semiconductor, abundant, efficient. Converts sunlight to electricity.
Explanation:
Parallel-faced slab: refraction at entry and exit cancel angular deviation, but ray shifts laterally. No net direction change. Memory tip: 'Slab: parallel emergent ray; Prism: deviated emergent ray'. Ray optics concept frequently tested in competitive exams.
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