When an object is placed at 2F1 of a convex lens, image is formed at the opposite 2F2 point. For this mirror 2F = 30 cm, we get f = + 15 cm.
ii. Clearly the observation no. 6 is wrong as the image distance should have been negative but it is given that it is positive.
This is so because a convex lens produces a virtual image when the object is between focus and the optical centre.
iii. Magnification is given by,
i. The two rays are originating from the top of the object. One is passing through the spherical centre of the mirror and the other ray is passing through the pole of the mirror.
ii. Magnification is given by,
So the distance between the screen and the object is 60-20 = 40 cm.
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