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Light & Sound

Reflection, refraction, lenses and sound waves.

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Q1 · Light & Sound · MEDIUM
A concave mirror is used as a shaving mirror. If a person's face is placed 15 cm from the mirror and the image formed is erect and magnified 2 times, what is the focal length of the mirror?
Q2 · Light & Sound · EASY
When a ray of light passes from air into glass, which of the following statements is correct?
Q3 · Light & Sound · MEDIUM
A convex lens of focal length 20 cm forms an image at a distance of 60 cm from the lens. What is the object distance?
Q4 · Light & Sound · EASY
The frequency of a sound wave is 500 Hz and its wavelength is 0.66 m. What is the speed of sound in the medium?
Q5 · Light & Sound · EASY
The frequency of a sound wave is 256 Hz and its wavelength is 1.3 m. What is the velocity of sound?