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Question 2: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments
A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror.
Solution: A convex mirror always form virtual image, which is erect and small in size of an object kept in front of it. Focal length of convex mirror ƒ = + 15 cm Object distance u = – 12 cm Using mirror formula
Therefore, image is virtual, formed at 6.67 cm at the back of the mirror. 
It shows the image is erect, small in size and virtual. When the needle is moved farther from mirror the image also move towards focus and decreasing in size. As u approaches v approaches focus but never beyond ƒ.
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments