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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.

Text Solution

AI Generated Solution

To solve the problem, we need to analyze the situation step by step, using the lens formula and understanding how intensity varies with distance from the lens. ### Step 1: Identify the given values - Focal length of the lens (F) = 20 cm - Distance of the point source from the lens (u) = -25 cm (the negative sign indicates that the object is on the same side as the incoming light) ### Step 2: Use the lens formula The lens formula is given by: ...
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