A technician wishes to produce an image on a wan using a thin lens. The lens to

Question

A technician wishes to produce an image on a wan using a thin lens. The lens to wall distance is to be 6 m. He also wants the image to be the same size as the object. What is the focal length of the lens he will need? A thin diverging lens has its focal points 30 cm from the lens. An object is located 40 cm from the lens. Which diagram best represents rays used to locate the image? A thin diverging lens produces an image of magnification 1/5 for an object located 20 cm from the lens. What is the focal length of the lens?

Explanation / Answer

USING LENS FORMULA

A)1/F=1/V-1/U

FOR EQUAL SIZE THE IMAGE AND OBJECT DISTANCE IS SAME

1/F= 1/6-1/-6= 2/6

F= 3m

10) OPTION A

11) OPTION D

12) M= V/U=1/5

U= -20 CM

V=- 4 CM

1/F= 1/V-1/U

                1/-4-1/-20

F=-5CM

OPTION D

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