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A point source of light S is placed on t...

A point source of light S is placed on the axis of a lens of focal length 20cm at a distance 25cm from lense. A screen is placed normal to the axis of lens at a distance x from it (treat all rays as paraxial). Identify the true or false statements.
a. As x is increased from zero , intensity continuously decreases.
b. As x is increased from zero, intensity first increases then decreases.
c. Intensity at center of screen for `x =90 cm` and `x=110 cm` is same.

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