Question

If you have an object 2 m from the concave mirror and the image is 4 m from the mirror then f is __________​

Answer 1

u= -2m

v= -4m

1/f= 1/u + 1/v

1/f= -1/2 -1/4

1/f= (-2-1)/4

1/f= -3/4

f= -4/3

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