Question

A student obtained a blurred image of an illuminated distant tower on a screen by using a convex lens In order to obtain sharp image of the tower on the screen, he must shift the lens:

• A. Towards the screen
• B. Away from the screen
• C. Away from the lens
• D. Either towards away or near the screen

Answer 1

The correct option is B

Away from the screen

Image Characteristics for a Convex Lens:

$\begin{array}{ccc}\text{Objection Position}& \text{Image Position}& \text{Image Charateristics}\\ \text{At F}& \text{At infinity}& \text{Infinitely big}\\ \text{Moving from F}& \text{Moving from infinity}& \text{Decreasing in size, virtual, upright}\\ \text{Towards lens}& \text{Towards lens}& \text{Larger than the object}\end{array}$