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                                    11. The image of an object formed by a mirror is real, inverted and is of magnification -1. If the image is at the distanceof 30 cm from the mirror, where is the object placed? Find the position of the image if the object is now moved 20 cmtowards the mirror. What is the nature of the image obtained? Justify your answer with the help of ray diagram. 3ORr of a lens? You have three lenses L, L2 and La of powers +10D, +5D and -10D respectivelyState the nature and fucal length of each lens. Explain which of the three lenses will form a virtual and magnifiedimage of an object placed at 15 cm from the lens. Draw the ray diagram in support of your answer | 
                            
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Answer»  The magnification is -1 means the image is real and inverted and is of the same size as that of the object.so if the image is at a distance of 40cm from the mirror then the object is also at a distance of 40cm from the mirror (because the object is placed at C ie center of curvature of the mirror.if the object is moved 20cm towards the mirror the object is placed at F ie at the principal focus and the image is formed at infinity.the nature of the mage so formed is real inverted and highly enlarged.  | 
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