Refraction Lenses and Polarisation

Light travelling in glass of refractive index n_g is incident at a boundary with water of refractive index n_w. The critical angle for the boundary is C. Which of the following expressions is correct for this boundary?

• A) sin C = 1/n_g

• B) sin C = n_w/n_g

• C) sin C = n_g/n_w

• D) sin C = 1/n_w

A ray of light, in air, is incident on the edge of a triangular glass prism as shown. The critical angle for a light ray meeting a glass to air boundary is 35°. Which path, A, B, C or D, will the ray follow?

• A

• B

• C

• D

A ray of light, in air, is incident on the edge of a triangular glass prism as shown. The critical angle for a light ray meeting a glass to air boundary is 35°. Which of the following gives the refractive index of the glass?

• sin 35

• 1 / sin 35

• sin^-1 (1 / 35)

• 1 / sin^-1 (1/ 35)

An object is placed 6.5 cm from a lens of focal length 3.9 cm. An image is formed 9.8 cm behind the lens. Which of the following expressions is equal to the magnification?

• 3.9/6.5

• 6.5/9.8

• 6.5/3.9

• 9.8/6.5

An object is placed in front of a lens. Which row of the table shows a combination that will produce a real image of the object?

• A

• B

• C

• D

Which of the labels A, B, C or D represents the focal point of the lens?

• A

• B

• C

• D

A diverging lens is used to produce an image of a real object. Select the row of the table that correctly identifies the nature of the image produced.

• A) Real, Upright

• B) Real, Inverted

• C) Virtual, Upright

• D) Virtual, Inverted

An object is placed 6.5 cm away from a lens of focal length 3.9 cm. An image is formed 9.8 cm from the lens. Which of the following is the magnification?

• 0.60

• 0.66

• 1.5

• 1.7

A converging lens is used as a magnifying glass. An image is produced that is 30 cm away from the lens and twice as big as the object. Choose the row that correctly identifies the nature of the image and the object distance.

• real, 15 cm

• real, 60 cm

• virtual, 15 cm

• virtual, 60 cm

The diagram shows a ray of light travelling from a transparent medium into air. The refractive index of the transparent medium is given by:

• A) sin 48° / sin 29°

• B) sin 42° / sin 29°

• C) sin 61° / sin 48°

• D) sin 61° / sin 42°