Introduction to Optics and Photonics

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What phenomenon causes the different colors to appear in a rainbow?

Dispersion of light inside the raindrop

Reflection and refraction of light from tiny raindrops

Diffraction of sunlight through clouds

Polarization of sunlight in the atmosphere

None

Which of the following best describes a laser?

A device producing light with very high energies

A beam of light with a broad range of wavelengths

A device that produces light with a well-defined wavelength and propagation direction

A special device that can be used to build a ‘light saber’, used in many science fiction movies

None

What is the technical term for the distortion or blurring in an optical image caused by imperfections in lenses or mirrors?

Polarization

Diffraction

Aberration

Interference

None

What is the actual color emitted by the LED chip (Light Emitting Diode) that is at the heart of almost every modern ‘white’ LED-lamp in your home?

Clearly, an LED chip emitting white light …!

A single LED chip emitting blue light

3 distinct LED chips are being used, each emitting red, green and blue light, mixing into ‘white’ light

An LED chip emitting infrared radiation, that is actually invisible to our human eye.

None

When light passes from air into water, it changes direction, it seems to ‘bend’. This phenomenon is known as:

Reflection

Diffraction

Polarisation

Refraction

None

Why does the sky appear blue during the day and the sunset appears red?

Blue light scatters more due to its shorter wavelength, while red light passes through the atmosphere more easily

Blue light is absorbed by the atmosphere, leaving only red light to reach us

Red light reflects off the earth's surface at sunset, giving the sky its color

Blue and red light mix to create the color of the sky and sunset

None

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