Rectilinear Propagation of Light
Physics ⇒ Light and Optics
Rectilinear Propagation of Light starts at 7 and continues till grade 12.
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See sample questions for grade 10
A student observes that the shadow of a tree is sharp at noon but blurred in the evening. Explain why.
A torch is shone through a straight tube. The light passes through easily. If the tube is bent, the light does not pass through. What does this demonstrate?
Describe an experiment to demonstrate the rectilinear propagation of light using three cardboards with holes.
Describe how the rectilinear propagation of light explains the occurrence of a solar eclipse.
Explain why a shadow becomes larger when the object is moved closer to the light source.
Explain why shadows are formed when an opaque object is placed in the path of light.
If you place a small object in front of a point source of light, what will you observe on the screen placed behind the object?
State one application of the rectilinear propagation of light in daily life.
State the law of rectilinear propagation of light.
What happens to the path of light when it passes from air into water?
What is meant by the rectilinear propagation of light?
Why do we not see sharp shadows on a cloudy day?
A laser beam is directed through a tank filled with clear water. If a small amount of milk is added to the water, the path of the laser beam becomes visible. Explain how this observation relates to the rectilinear propagation of light.
A narrow beam of sunlight enters a dark room through a small hole in the window. The beam appears as a straight line in the dusty air. What does this observation indicate about the nature of light?
A student claims that the formation of a mirage in a desert is due to the rectilinear propagation of light. Is this claim correct? Justify your answer.
A student sets up two pinhole cameras, one with a straight tube and one with a curved tube, and places them in front of a candle flame. Only the camera with the straight tube forms an image. What does this experiment demonstrate about the nature of light?
Explain why the edges of a shadow formed by a small point source of light are sharp, while those formed by an extended source are blurred.
If the speed of light in a medium changes gradually from one side to another, will light still travel in a straight line? Explain your answer.
A beam of light is incident on a glass slab at an angle. The light emerges from the other side, but its path inside the slab is not straight with respect to its original direction. Does this observation support or contradict the rectilinear propagation of light? Explain your reasoning.
A student claims that the reason we cannot see the sun at night is due to the rectilinear propagation of light. Critically analyze this statement.
