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Total internal reflection
Refraction
Diffraction
Reflection
A periscope works on the principle of
A permanent magnet can affect
A person can jump higher on the moons surface than on the earth because:
A person is hurt on kicking a stone due to
A person is sitting in a car which is at rest. The reaction from the road at each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at either of the front wheels vary?
A person is standing in front of a wall and makes a sound. What should be the normal minimum distance between the person and the wall , so that the person hears echo?
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is
A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focussed in his eyes
A photo-electric cell converts
A photostat machine works on