6.0 Light and Optics

Diagram 1 (a) shows the light travels from medium X to medium Y and Diagram 1(b) shows the light travels from medium X to medium Z. The density of the medium in descending order is

• Z, X, Y

• Y, X, Z

• Z, Y, X

• X, Y, Z

Diagram 2 shows a ray of light passing in to a glass block. The refractive index of the glass is 1.52. What is the angle of incidence?

• 19.7°

• 33.7°

• 60.7°

• 68.0°

Diagram 3 shows light ray travels from air to glass block. What happen to light ray when it enters the glass block?

• The light refracts towards normal as it enters the glass block.

• The incident angle is equal to the refracted angle.

• The light travels faster as it enters the glass block.

• The brightness of light increases as it travels in the glass block.

Diagram 4 shows two light rays propagate from block X to air. Diagram 4 shows two light rays propagate from block X to air

• 18°

• 23°

• 50°

• 48°

Which of the following angle in diagram below shows the critical angle of the glass?

• 
• 
• 
• 

Diagram 5 shows light ray travels through an optical fibre. Which statement is correct?

• Angle of θ is smaller than critical angle of inner core.

• Angle of θ is smaller than critical angle of outer cladding

• The refractive index of inner core is higher than the outer cladding

• The refractive index of outer cladding is higher than the inner core

An object is placed 50.0 cm in front of a convex lens. A sharp image is formed on the screen placed 12.5 cm behind the lens. Berapakah panjang fokus kanta tersebut? What is the focal length of the lens?

• 0.1 cm

• 10.0 cm

• 37.5 cm

• 52.5 cm

Suzy found that she can see all her classmates by using a lens as shown in Diagram 6. Which is correct about the lens that Suzy used and the characteristic of its image?

• Type of lens : Convex

  Characteristic of image : Virtual and smaller

• Type of lens : Convex

  Characteristic of image : Real and smaller

• Type of lens : Concave

  Characteristic of image : Real and smaller

• Type of lens : Concave

  Characteristic of image : Virtual and smaller

A student uses a converging lens to produce an enlarged virtual image of an object. The focal length of the lensis 15 cm. Apakah jarak objek yang sesuai? What is the suitable object distance?

• 10 cm

• 20 cm

• 25 cm

• 30 cm

Halim find that it is difficult to read a map on his journey. So, he uses a lens to help him as shown in Diagram 7. Halim find that it is difficult to read a map on his journey. So, he uses a lens to help him as shown in Diagram 7

• 
• 
• 
•