Q21 of 112 Page 310

Name a device which works on the reflection of reflected light.

Periscope is one such device which works on the reflection of reflected light.

The light from the object falls on one mirror that is placed at 45o to the object and the light gets reflected. This reflected light in turn falls on another mirror and is again reflected until it reaches the eyepiece.


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19

Is the image of an object in a plane mirror: virtual or real?          

 20

Name the phenomenon responsible for the following effect:

When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.

 22

How are the two plane mirrors in a periscope arranged:

(a) with respect to one another?


(b) with respect to sides of the tube?

 23

What will be the number of images formed when an object is placed between two parallel plane mirrors facing each other?