Suppose you are given a tube of the shape shown in the Fig.11.20 and two plane mirrors smaller than the diameter Class 7

Suppose you are given a tube of the shape shown in the Fig.11.20 and two plane mirrors smaller than the diameter Class 7

Suppose you are given a tube of the shape shown in the Fig.11.20 and two plane mirrors smaller than the diameter of the tube. Can this tube be used to make a periscope? If yes, mark where you will fix the plane mirrors. Class 7

Answer:

Yes, this tube can be used to make a periscope.

We do not see the shadow on the ground of a bird flying high in the sky. However, the shadow is seen on the ground when the bird swoops near the ground. Think and explain why it is so.

Answer:

When the bird (object) is very high in the sky, the distance between bird and ground (screen) is also high. The image formed on the ground is longer and blurrier. Image formed but difficult to notice. Conversely, when the bird is near the ground, the distance between the ground and object is shorter, a smaller and sharp image is formed, which is visible.