Q18 of 112 Page 310

If an object is placed at a distance of 7.5 cm from a plane mirror, how far would it be from its image?

The object would be 15cm far away from its image if it is placed at a distance of 7.5cm from the plane mirror.

The object is at 7.5cm from the mirror, then the image of the object is 7.5cm on the other side of the mirror. Hence, the image is a total of 15cm from object (7.5cm to the mirror+ 7.5cm to the image).

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16

Which type of reflection of light, regular reflection or diffuse reflection, leads to the formation of images?

 17

What type of reflection of light takes place from:

(a) a cinema screen?


(b) a plane mirror?

 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.