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Light & Sound

Reflection, refraction, lenses, mirrors, sound waves and Doppler effect

Sample Practice Questions

Total internal reflection occurs when light travels from:
- Rarer to denser medium
- Denser to rarer medium at any angle
- Denser to rarer medium at an angle greater than critical angle
- Rarer to denser at critical angle
Show answer

Answer: Denser to rarer medium at an angle greater than critical angle
Infrared rays have _____ than red light.
- Shorter wavelength
- Longer wavelength
- Higher frequency
- Greater speed
Show answer

Answer: Longer wavelength
Which device uses the principle of total internal reflection?
- Periscope
- Telescope
- Optical fibre
- Microscope
Show answer

Answer: Optical fibre
The minimum distance of clear vision for a normal human eye is:
- 10 cm
- 25 cm
- 50 cm
- 100 cm
Show answer

Answer: 25 cm

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Practice Questions

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Frequently Asked Questions

What does Light & Sound cover in the NTSE exam?

Reflection, refraction, lenses, mirrors, sound waves and Doppler effect.

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