1. A convex lens is capable of producing what kind(s) of images?

Question

a. real only

b. virtual only

c. real or virtual

A 15 cm tall object is placed 30cm to the left of a concave lens. An image forms 9 cm to the left of the lens.

2. What is the magnification or the image?

3. How tall will the image be?

please help =)

Answer 1

A convex lens can produce two types of image i.e.,real or virtual depending upon the position of the object.If the object is placed beyond focus of the convex lens ,a real image is formed and if the object is placed within the focus ,a virtual image is formed.

So the answer is c.

Height of the object =15cm

object distance u =-30cm(-ve sign is due to sign convention)

Image distance v=-9cm

Magnification m=v/u=-9cm/-30cm=0.3

Again m=height of the image/height of the object

height of image=m x height of object=0.3 x 15cm=4.5cm.