Question

 A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of image , the position of object will be at 
25 cm
+10 cm
-10 cm
At infinity​

Answer 1

Option ( B ) is correct thanks

Answer 2

Answer:

option(c) -10cm

Explanation:

it is the 6th case of convex mirror where image is between pole and focus

if focal length is 20 cm then focus is also at 20cm

now option (a)and (d) are eliminated

now object is negative because it is always located left side of your axis which we consider as pole. so it will be negative

so ans is -10

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