Question

You are given a convex lens of focal length 15 cm. Draw a ray diagram to show the

image formed when the object is kept at a distance of 40 cm from the lens. (Use approp
plz tell full ans with diagram​

Answer 1

answer is 60 cm as it is convex lens and formed behind the mirror

Answer 2

Answer :-

› Focal length of the convex lens = + 15 cm

› Object distance = - 40 cm

› Image distance = ?

By using the lens formula,

› 1/f = 1/v - 1/u

› 1/v = 1/f + 1/u

› 1/v = 1/15 - 1/40

› 1/v = 8-3/120

› 1/v = 5/120 = 1/24

› v = 24 cm

Magnification, m = v/u

› m = 24/40

› m = 3/5 -› size of the image as compared to the object.

Image - Real and Inverted.

Hope it helps!