Question

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Answer 1

The student who use the lens of focal length 40cm is a concave lens and therefore the image formed is diminished and virtual.

whereas other students, who uses the lenses of -40cm is a convex lens and therefore the image formed is magnified, diminished, or of same size as the object according to the distance of the object from the lens and is a real image.

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Answer 2

Answer:

P1 =2.5D

P2 = - 2.5 D

Explanation:

power = 1/ focal length

hence,

for first lens,

P1 = 1/( 0.4 m) = 2.5 per meter = 2.5 diopter = 2.5D

image is diminished and virtual

and for second lens,

P2 = 1/(-0.4 m) = - 2.5 D

image is magnified and real.