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CBSE Class 10 Science 2017 Delhi Term II Set 1 Paper

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Question : 4
Total: 36
An object is placed at a distance of 30‌cm in front of a convex mirror of focal length 15 cm. Write four characteristics of the image formed by the mirror.
Solution:  
Given : u=−30‌cm,f=15‌cm.
We know that, ‌
1
v
+‌
1
u
=‌
1
f

‌
1
v
‌=‌
1
15
+‌
1
30
=‌
2+1
30
=‌
3
30

v‌=10‌cm
Characteristics of image :
(i) Image formed is erect.
(ii) Image formed is small in size.
(iii) Image formed is virtual.
(iv) Image is formed at a distance of 10‌cm behind the mirror between focus and pole.
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