FORM 5 Chapter 7.1 Formation of Images by Lenses

Which of the following lenses is a diverging lens?

• Convex lens

• Concave lens

• Cylindrical shape lens

• Magnifying glass

The diagram shows an object placed in front of a concave lens. What are the characteristics of the image formed?

• Real, inverted, magnified

• Real, inverted, diminished

• Virtual upright, magnified

• Virtual, upright, diminished

What is the position of the object when the convex lens is used as a magnifying glass?

• Object distance, u > focal length, f

• Object distance, u = focal length,f

• Object distance, u < focal length,f

• The object is between F and 2F

The diagram shows an object is placed in front of a convex lens. The focal length, f is 10 cm, and the object distance from the lens,u is 15 cm. What are the characteristics of the image formed?

• Real, inverted, magnified

• Real, inverted, diminished

• Virtual, upright, magnified

• Virtual, upright, diminished

Which of the following is a correct ray diagram for convex lens?

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• 
• 
• 

Which of the following arrangements of objective lens, eyepiece, and position of the first image is correct for a telescope at normal adjustment?

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• 
• 
• 

The diagram shows a ray diagram for a convex lens.

Which point A, B, C or D is the optical centre?

• A

• B

• C

• D

Which ray diagram is correct for convex lens?

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• 
• 
• 

The diagram shows the position of an image formed by a convex lens.

At which position A, B, C or D, will an observer be UNABLE to see the image?

• A

• B

• C

• D

A microscope containing an eyepiece with a magnifying power of 4 times and an objective lens with a magnifying power of 40 times. Calculate the magnifying power of the microscope.

• 10 times

• 36 times

• 44 times

• 160 times