A luminous object is separated from a screen by distance d. A convex lends is placed between the object and the screeen such that it forms a distinct

Question

A luminous object is separated from a screen by distance d. A convex lends is placed between the object and the screeen such that it forms a distinct

A luminous object is separated from a screen by distance d. A convex lends is placed between the object and the screeen such that it forms a distinct image on the screen. The maximum possible focal length of this convex lens is.
A. 4d
B. 2d
C. `(d)/(2)`
D. `(d)/(4)`

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - D
Focal length of a convex lens by displacement method is given as, `f=(a^(2)-b^(2))/(4a)`
Where, a= distance between the image and object and b=distance between two position of lens
Here, a=d and to form a distinct image b=0, so the mamimum possible focal length is d/4.

5 views Answered 2023-02-05 15:29