Question

A thin convex lens of focal length 25cm is cut into two pieces 0.5cm above the principal axis. The top part is placed at (0, 0) and an object is placed at (-50cm, 0).find the coordinates of the image 

(1) (50cm,-2cm) 

(2) (50cm,-1cm) 

(3) (25cm.-1cm) 

(4) (15cm,-1cm)

Answer 1

Correct option (2) (50cm,-1cm)

Explanation:

To part of cutted lens is placed at (0.0) and object placed at (-50cm, 0). There is no effect on the focal length or lens By applying lens formula

So image is found at 50cm from pole and 0.5cm below the principal axis With respect X axis passes through the edge of cut lens. Coordinates of image are (50cm,- 1cm)