JEE Main20254 Apr 2025Morning ShiftPhysicsRay OpticsActual

Distance between object and its image ( magnified by - 1 3 ) is 30 cm. The focal length of the mirror used is ( x 4 ) cm , where magnitude of value of x is _________.

Correct answer

Step-by-step solution

aligned & M=- 1 3 & - -V -U = -1 3 V= U 3 aligned Distance b / w object and image : aligned & U - V =30 & U - 3 =30 & U =45 ~V =15 & 1 f = 1 ~V + 1 U =- 1 15 - 1 45 & ~F = 45 4 & x =45 aligned

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