Q

A concave mirror forms an image at distance v for an object at distance u. Its focal length is:

RRB Group-D 28/09/2022 / Shift-II 2022
✓ Answer: C uv/(u + v)
Rearranging 1/f = 1/u + 1/v gives f = uv/(u + v), using signed distances.
← Previous Question Next Question →

📚 Related Questions — Light

1 A convex mirror has focal length 15 cm. Under the Cartesian convention,… 2 A candle is placed between the centre of curvature and principal focus… 3 Photographs taken from a satellite show the sky as dark because: 4 Which of the following defects of vision is corrected using a concave… 5 When a person standing underwater looks upward at a tree located on… 6 An incident ray passes through the focus of a concave mirror. The…