Hot Questions : Thinks and answer : (Lesson : 12) 1) Which of these a completely transparent object or a translucent objects-will form a shadow? Will the shadow formed by an opaque object be darker or lighter than this shadow? 2) Can an object form two or more shadows at the same time? How? 3) What will be the colour of a shadow formed in red light? 4) Does a pinhole camera form an image or a shadow of an object? Justify your answer. 5) Can a pinhole camera form an image which is bigger than the object? If yes, explain with a diagram.
Answers
1) a translucent object will form a shadow, but the shadow formed by an opaque object will be darker.
2) yes, an object can form two or more shadows at the same time. This happens when there are more than one light source available. Example-Formation of many shadows of players in the presence of many light sources during a cricket match in a stadium at night.
3) the color of shadow does not change with the changing color of light. it will remain grey-black color.
4) pinhole camera forms an image using the incoming light ,similar to the way our eye works. Pinhole camera forms an image, which is inverted. you will see that rays of light coming from the top and bottom of an object pass the hole and move in straight lines. thus, rays from the top of the objects fall at the bottom of the screen and those from the bottom of the object fall at the top of the screen.
5)Yes, pin hole camera can form image bigger than the object. this can be done by increasing the distance between the screen and the pinhole.
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Answer:
1) A translucent object has more tendancy to form a shadow as it blocks the light partially. And, transparent objects does not blocks the path of light. Though, a dark shadow will not be formed in the case of translucent object.
Shadow formed by an opaque object is darker than translucent.
2)No, it is not possible. An object will form only one shadow at a time.
3) The Shadow formed by a red or black or of any colour will be black only.
4) It forms an inverted image on the pinhole camera.
5)No,it only forms an erect and inverted image.
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