Question

1 point
Question 7. Teacher gives
convex lens and concave mirror
of focal length of 20cm each to
his student and asks him to find
their focal lengths by obtaining
the image of a distant object.
The student uses of distant tree
as the object and obtains its
sharp image, one by one, on
screen. The distances D1 and
D2 between the lens / mirror
and the screen in the two cases
and the nature of their
respective sharp images are
likely to be :​

Answer 1

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