Rankers Physics

Reflection by Spherical Mirrors: Practice Problem & Solution

A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that the end closer to the pole is 20 cm away from it. Find the length of the image : Reflection by Spherical Mirrors diagram: A rod of length 10 cm lies along
5 cm
15 cm
30 cm
10 cm

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1. Assertion (A): A concave mirror and a concave lens have the same focal length in air. When dipped in water, the focal length of the two are equal. Reason (R): The focal length depends only on the radii of curvature.  
2. A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is: (2012 Mains)
3. A person looks into a shaving mirror. The size of image of his face is twice the actual size of his face. If the face is at a distance 20 cm then find the radius of curvature of the mirror :
4. The image of an object placed perpendicular to the principal axis of a mirror, will be erect if :
5. A light ray traveling parallel to the principal axis of a concave mirror strikes the mirror at angle of incidence q. If radius of curvature of the mirror is R, then after reflection, the ray meets the principal axis at distance d from the centre of curvature, then d is