the answer to this is 1,2,3,4,5,6 or all?

Dear student,
Since it's a convex lens and power is +5D.
SO, f= 100/d cm = 20cm.
So u is greater than 20 in all case so real image will be formed.
But in all cases sign of u and v is same, it means that both are being formed at same side of lense but real image is always form opposite side of lense.
So all are false.
You can also check the condition using lens formula,
1/v - 1/u = 1/f.

Regards

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