Question

Q1. Under which of the following conditions a concave mirror can form a virtual image larger than the actual object? (a) When the object is kept at a distance equal to its radius of curvature (b) When object is kept at a distance less than its focal length (c) When object is placed between the focus and centre of curvature (d) When object is kept at a distance greater than its radius of curvature Q2. Rays from Sun converge at a point 15 cm in front of a concave mirror. Where an object should be placed so that size of its image is equal to the size of the object? (a) 15 cm in front of the mirror (b) 30 cm in front of the mirror (c) between 15 cm and 30 cm in front of the mirror (d) more than 30 cm in front of the mirror Q3. In torches, search lights and headlights of vehicles the bulb is placed (a) between the pole and the focus of the reflector (b) very near to the focus of the reflector (c) between the focus and centre of curvature of the reflector (d) at the centre of curvature of the reflector Q4. The laws of reflection hold good for (a) plane mirror only (b) concave mirror only (c) convex mirror only (d) all mirrors irrespective of their shape​

Answer 1

Answer:

Explanation: A concave mirror can form an image larger than the actual object when the object is placed between the focus and centre ofcurvature. Image formation is shown below, where object (AB) is placed between the focus and centre ofcurvature for which image (A'B') is obtained behind the mirror.