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Incident, Reflected and Normal Rays in the Mirror, , , , , cdi, , gwe----------, Incident Ray, , , , The laws of reflection are, , 1. The incident ray, the reflected, ray and the normal (at the, point of incidence) , all lie in the, same plane., , 2. The angle of incidence is equal, , to the angle of reflection.
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Aim : To verify the Ist law of reflection., , Required material: Mirror strip, drawing board, white, , paper, pins, clamps, scale, , and pencil., , Procedure :, , 6., , 10., , ll., , , , . Take a drawing board and fix a white paper on it, , with the help of clamps., , . Draw a straight line AB at the centre of the, , paper and also a normal (ON) to AB at point ‘O’., , . Draw a straight line PQ making certain angle, , (Angle i) with ON., , . Fix two pins at the points P and Q on the paper, , vertically., , . Observe the image P’ of the pin ‘P’ and ‘Q’ of, , the pin ‘Q’ in the mirror kept along the line AB., Fix two more pins R and S such that they are in, the same line as that of P’ and Q’. Join RjS and, ‘O°, , . Measure the angle between RS and ON (angle of, , reflection)., , . You will find that Angle of incidence = Angle of, , reflection, , . Repeat the experiment with different angles of, , incidence and measure the corresponding angles, of reflection., , In all cases you will observe Angle of incidence =, Angle of reflection, , Hence Ist law of reflection is verified., , ‘I
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To prove:, , The second law of reflection., Materials required:, , ¢ Mirror 3 question, ¢ Board, , « White sheet of paper, , ¢ Protractor, , ¢ Pencil ao, * Scale ot, e Pin wr, ea?, Procedure :, , Fix the white paper on the, board using pins., , * Trace the corners of the mirror, on the paper., , * Draw lines perpendicular to the, corners of the mirror so that it, forms the normal., , « Place the mirror over the white, sheet such that the reflected, image of the normal is obtained., , » Place two pins on the reflected, image of the normal, such that, the image and the normal, belong to a single straight line., , * Take the mirror and the pins, and join the dots to make a, straight line., , * So if we take one ray as the, incident ray, then the other is, reflected. Hence the reflected, ray, the normal, and the, incident ray lie on the same, line, which represents the plane, of reflection.
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1. The light ray which is coming from top of, the tree goes towards the bottom of the, pinhole camera screen through the, pinhole., , 2. The light ray which is coming from, bottom of the tree goes towards the top of., the pinhole camera screen through the, pinhole., , 3. In this way the light coming in a, particular direction from each point of the, tree, will be able to enter into the pinhole, and the light going in other directions is, blocked., , 4. This leads the formation of an inverted, images., , 5. If we increase the size of the hole of, pinhole camera, we get blurred image on, the screen., , 4 question, , draw the diagram, of pin hole camera, see the text book
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6question. The surface of Rain water pools, acts as a concave mirror. Light rays coming, from the sky act as parallel rays and strike, the surface of water. Thus, the image of sky, , appears diminished and often inverted.
