Question

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Q. An object is placed 0.4m from a convex mirror and a plane mirror is placed at a distance of 0.3m from the object. The images formed in the two mirrors coincide without parallax. What is the focal length of the convex mirror?
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Answer 1

focal length, is positive for a concave mirror, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted.

The focal length will be 0.045

Answer 2

Answer:

v = (0.4 – 0.3) m = 0.1 m

u = -0.4 m

f = ?

By mirror formula:

1/v + 1/u = 1/f

=> 1/0.1 - 1/(0.4) = 1/f

=> f = 0.13 m