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Ans 3:
Class : Class 10 
                                                                                                        
                                                                                                        ya. I can explain it. It is a very imple theory . The more nearer you are to the window  , the more is the range of up to how much length can you see what is at your backside. Her  , 12 m is so long , that the panter can only see in the mirror 1m of painted wall behind its back. Thereby , 1m is the correct answer
                                                                                                    
                                                                                                    Ans 10:
Class : Class 10 
                                                                                                        
                                                                                                        sorry , in last place it must be 2m.... if it is more that 25 metre , then only he can see 1 metre