Question

Support you
9. One-half of a convex lens is covered with a black paper.
complete image of the object? Verify your answer experimentally. Explain your
observations.

14. An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex
mirror of radíus of curvature 30 cm. Find the position of the image, its nature
and size.
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Answer 1

height of object = 5 cm

distance of object = -20 cm

radius = 30 cm

focal length= r/2 = 15 cm

we know that, 1/f = 1/ v -1/ u

1/15 = 1/ v -(-1/ 20 ) = 1/20

1 / v = 1 / 15 -1 / 20

1 / v = 1/60

v = 60 cm

magnification = v/ u = 60/-20

= -3

then image is smaller than the object

image is virtual and erect