OPTICS MCQ Quiz: GKFix - Bridge of Knowledge

Question 1

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What is a key assumption made about the thickness of the lens and the liquid layer in this analysis?

They are infinitely thick
They are considered thin compared to the object and image distances.
They must be exactly 1 cm thick
They are considered thick lenses

Question 2

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What is the magnification (m) of the image formed when it coincides with the object at the focal point?

0
1
-1
+1

Question 3

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What type of image is formed by the lens system on the needle when the inverted image coincides with the needle?

A virtual image
A real image
An enlarged virtual image
A diminished real image

Question 4

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Why is it important to ensure the needle's tip is precisely on the principal axis of the lens?

To make the needle visible in the dark
To ensure the needle casts a shadow
To maintain the symmetry required for the paraxial approximation and accurate focal length measurement.
To match the color of the light source

Question 5

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What would be the effect on the measured combined focal length if the liquid had a refractive index much closer to that of the glass lens (e.g., n_liquid = 1.49)?

The combined focal length would be significantly shorter (more converging)
The combined focal length would be significantly longer (less converging).
The combined focal length would be negative
The combined focal length would be unchanged

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