Concave Lenses

Another word for a diverging lens is a...

• concave lens

• convex lens

Is a concave lens thicker or thinner in the middle? 

• Thicker 
• Thinner 

What does the word "diverging" mean?

• to spread apart
• to come together
• parallel
• perpendicular

What kind of image is always formed in a diverging (concave) lens?

• Virtual image

• Real image

True or false: the images formed by concave lenses are always upright and diminished

• True

• False

An object is placed 30 cm from a concave lens of focal length 20 cm. Find the image distance and nature of the image.

• 12 cm, virtual image

• 14 cm, real image

• 10 cm, virtual image

• 20 cm, virtual image

Find the nature and position of the image of an object placed 10 cm from a diverging lens of focal length 15 cm.

• v = 6 cm, virtual image

• v = 8 cm, virtual image

• v = 20 cm, real image

• v = 4cm, virtual image

An object is placed 20 cm from a diverging lens of focal length 20 cm. If the object is 5 cm high, find the position, nature and height (h) of the image.

• v = 10cm, virtual image, h = 2.5 cm

• v = 15 cm, virtual image, h = 3 cm

• v = 20 cm, virtual image, h = 6 cm

• v = 25 cm, virtual image, h = 8 cm