MP Board Class 7th Maths Solutions Chapter 15 Visualising Solid Shapes Ex 15.4
A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow.
The shapes of the shadows of these figures will be as follows.
(i) A ball
The shape of the shadow of a ball will be a circle.
(ii) A cylindrical pipe
The shape of the shadow of a cylindrical pipe will be a rectangle.
(iii) A book
The shape of the shadow of a book will be a rectangle.
Here are the shadows of some 3-D objects, when seen under the lamp of an overhead projector. Identify the solid(s) that match each shadow. (There may be multiple answers for these!)
The given shadows can be obtained in case of the following objects.
(i) Compact disk
(ii) A dice
(iii) Triangular pyramid
Examine if the following are true statements:
(i) The cube can cast a shadow in the shape of a rectangle.
(ii) The cube can cast a shadow in the shape of a hexagon.
A cube can cast a shadow only in the shape of a square. Therefore, any other shape is not possible.