railway RRB Group D Mock Test Series 2024-25 Physics Optics Refraction and Reflection

An object is placed at 20 cm in front of a concave mirror and the image formed by this mirror is at 60 cm in front of the concave mirror. What is the focal length of the mirror?

1

-15 cm

2

-20 cm

3

-30 cm

4

None of the above

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