CBSE Class 10 Science 2021 Term 1 Solved Paper

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Question : 40
Total: 60
The radius of curvature of a converging mirror is 30cm. At what distance from the mirror should an object be placed so as to obtain a virtual image?
Solution:  
Radius of curvature of converging mirror(concave mirror) is 30cm.
To obtain a virtual image in case of concave mirror, object should be placed between pole and focus. Using, Focal length:
Radius
2
=
30
2
=15cm

Therefore, object should be placed between 0 cm and 15cm.
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