Physics
Which of the following values can represent the magnification of a simple microscope?
- +1
- –1
- +2
- –2
Answer
+2
Reason — In a simple microscope a convex lens is used to view close objects so it's magnification should be positive, because the image formed is virtual, erect, and magnified, typically greater than 1, since the purpose is to enlarge the image.
So, from the given options +2 power is justified since it will produce virtual, erect and 2x magnified image of the object.
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A crowbar of length 1.0 m has its fulcrum at a distance of 0.2 m from the load. The mechanical advantage of the crowbar is:
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Which of the following figures will depict deviation of a ray of light through 90° when it emerges out of the prism.
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An object placed at a distance 30 cm in front of a lens produces clear inverted image at a distance 60 cm from the lens. If the object is placed at 60 cm from the lens, then it produces a clear inverted image at a distance of …………… from the lens.
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Assertion (A) : Quartz prism is used to study ultraviolet spectrum.
Reason (R) : Quartz does not absorb ultraviolet radiations.
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- (A) is true but (R) is false.
- (A) is false and (R) is true.