An object is placed at a distance of $$25$$ cm from the pole of a convex mirror and a plane mirror is set at a distance $$5$$ cm from convex mirror so that the virtual images formed by the two mirrors do not have any parallax. The focal length of the convex mirror is

Question

Infinity Learn · Accepted Answer

Clearly, the distance of  IMAGE  I from P is $$15$$ cm. WITH RESPECT TO THE MIRROR  IMAGE WILL BE FORMED AT $$20$$ cm on the other side of it.Now,  $$u=$$−$$25cm$$,$$v=15cm$$,$$f=$$?$$1u+1v=1f$$  or  $$1f=1$$−$$25+115or$$ $$1f=$$−$$3+575$$  $$f=752cm=37.5cm$$

An object is placed at a distance of 25 cm from the pole of a convex mirror and a plane mirror is set at a distance 5 cm from convex mirror so that the virtual images formed by the two mirrors do not have any parallax. The focal length of the convex mirror is

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