The focal length of a huge concave mirror is 120 cm. A man is standing in front of it at a distance of 40 cm. What are the characteristics of his image in that mirror ?
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QUESTION :
The focal length of a huge concave mirror is 120 cm. A man is standing in front of it at a distance of 40 cm. What are the characteristics of his image in that mirror ?
ANSWER :
• Image form in the mirror
• Virtual image
• Erected image
• Enlarged image
Answered by
12
Here u=(-40)cm,f=(-120)cm.
1/v+1/u=1/f
=>1/v=1/f-1/u
=1/(-120)-(-1/40)=
(1/40)-1/120=1/60
=>v=60cm
so,
magnification=60/(-40)=-1.5
=>the image is virtual,magnified ,erect.
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