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Practice each question, then open the answer or worked solution.
You have $3$ opaque strips with very small holes of different shapes as shown in Fig. $11.5$. If you obtain an image of the sun on a wall through these holes, will the image formed by these holes be the same or different?
Ans: The hole in the opaque strips will work as a pinhole camera and an image of the sun will be obtained on the wall. The images formed by these holes will be the same.
Observe the picture given in Fig. $11.6$. A sheet of some material is placed at position ‘P’, still the patch of light is obtained on the screen. What is the type of material of this sheet?
Ans: Light passes only through transparent material. So, sheet P must be of transparent material like a thin plastic or a ground glass.
Three torches A, B and C shown in Fig. $11.7$ are switched on one by one. The light from which of the torches will not form a shadow of the ball on the screen.
Ans: We can see in the given image that torch A and B are placed in front of the screen and we know that light travels in a straight line. So, they will form an image. Whereas, torch C is placed parallel to the screen, so it will not form a shadow.
Look at the figure given in Fig. $11.8$.
Will there be any difference in the shadow formed on the screen in A and B.
Ans: Formation of image depends on the shape and size of the object. Hence, the shadow formed on screen A and screen B will be the same because the same bowl is used in both the cases.