Q50 of 112 Page 311

State the various uses of a periscope.

● A periscope is used to see over, through or around any object.


● It can be used to see over a wall, to see around a corner.


● Periscopes are also used in warfare to keep an eye on the enemy.


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48

You see your image in a plane mirror? State two characteristics of the image so formed.

 49

What is a periscope? How many mirrors are there in a periscope?

 51

Explain how, a hair dresser makes you see hair at the back of your head after the hair cut is complete.

 52

How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another?

(a) 120°


(b) 45°


(c) 180°


(d) 60°


(e) 90°