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प्रश्न
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उत्तर
Three distinctions between light and sound waves are
(a). Light waves can travel through a vacuum while sound waves cannot.
(b). Light waves are transverse waves while sound waves are longitudinal waves.
(c). The velocity of light in air is 3 x 108 m/s while the speed of light in air is just about 330 m/s.
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संबंधित प्रश्न
Draw a diagram to show the reflection of a ray of light using a plane mirror. In the diagram, label the incident ray, the reflected ray, the normal, the angle of incidence and the angle of reflection.
State two advantages and two disadvantages of the reflecting periscope.
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An object 3 cm high produces a real image 4.5 cm high when placed at a distance of 20 cm from a concave mirror. Calculate:
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- focal length of the concave mirror.
The moon ______ sun light.
Say TRUE or FALSE
We see planets because they reflect light from the sun
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The angle of incidence is equal to the angle of reflection for perfect reflection.
Select the WRONG statement in case of image formed by a plane mirror.
