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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-34

  • question_answer
    What happens when a ray of light enters slab of glass from air?

    A)  Its wavelength decreases

    B)  Its wavelength increases

    C)  Its frequency increases

    D)  No change occurs in wavelength and frequency

    Correct Answer: A

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