Physics Form 4 Chapter 6 Light

Which of the following statements is true?

• A convex lens has 4 dioptre power having a focal length 0.25 m

• A convex lens has –4 dioptre power having a focal length 0.25 m

• A concave lens has –4 dioptre power having a focal length 0.25 m

• A concave lens has 4 dioptre power having a focal length 0.25 m

The diagram shows the image of a clock in a plane mirror. What time is shown?

• 02:25 
• 02:35 
• 09:25 
• 09:35 

The image which is obtained on a screen

• upright

• impression

• virtual image

• real image

The inner surface of a steel spoon acts as a ………………….. mirror.

• plane mirror

• convex mirror

• concave mirror

• convex lens

A virtual image

(a) can be formed on the screen

(b) cannot be formed on the screen

(c) is formed only by a plane mirror

(d) is formed only by the convex mirror

• a

• b

• c

• d

A light ray enters from medium A to medium

B as shown in The refractive

index of medium B relative to A will be

• greater than unity

• less than unity

• equal to unity

• zero

A man sees a stone at the bottom of a pool of water. Which path could be taken by light from the stone to the man? 

• A
• B
• C
• D

The path of a ray of light coming from air

passing through a rectangular glass slab

traced by four students are shown as A,

B, C and D in Figure 10.5. Which one of

them is correct?

• 
• 
• 
• 

A ray of red light enters a semi-circular glass block normal to the curved surface. Which diagram correctly shows the partial reflection and refraction of the ray? 

• A
• B
• C
• D

An eye views an object O by reflection in a plane mirror. Which is the correct ray diagram?

• A

• B

• C

• D