Answer the question in one sentence each (Alternatives are to be noted): On what condition a convex lens produces real images of an object on a screen at two positions of the lens? Or, Sunnray, sodium light and headlight of an automobile - which of these light are polarised?

Answer the question in one sentence each (Alternatives are to be note

1.	Answer the question in one sentence each (Alternatives are to be noted): On what condition a convex lens produces real images of an object on a screen at two positions of the lens? Or, Sunnray, sodium light and headlight of an automobile - which of these light are polarised?
Answer» SOLUTION :The distance (D) between the object and the screen should be greater than four times the focal length (f) of the CONVEX lens. That is, `D gt 4F` Or, NONE of the three is POLARISED.

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Answer the question in one sentence each (Alternatives are to be noted): On what condition a convex lens produces real images of an object on a screen at two positions of the lens? Or, Sunnray, sodium light and headlight of an automobile - which of these light are polarised?

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