Physics
A microscope used in pathological laboratories forms

Diminished, virtual and erect image
Diminished, real and erect image
Magnified, virtual and inverted image
Magnified, virtual, erect image

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Physics
Planets do not twinkle because

They emit light of a constant intensity
They are very far away from the earth resulting in decrease in intensity of light
They are nearer to earth and hence we receive a greater amount of light.
Their distance from the earth does not change with time

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